CBSE Class 12 Chemistry Question Paper 2026 (Set 1 - 56/5/1) with Solutions is now available here for download. CBSE conducted the Class 12 Chemistry examination on February 28, 2026, from 10:30 AM to 1:30 PM.
CBSE Class 12 Chemistry paper is of total 100 marks out of which 70 marks are allocated to the theory paper and 30 marks are for practical examination.
The theory paper consists of 33 questions divided into five sections:
- Section A contains Multiple Choice Questions (MCQs),
- Section B contains Very Short Answer Type (VSA) Questions,
- Section C contains Short Answer Type (SA) Questions,
- Section D contains Case-Study based Questions,
- Section E contains Long Answer (LA) Type Questions.
All sections are compulsory.
CBSE Class 12 Chemistry Question Paper 2026 (Set 1 - 56/5/1) with Solution PDF
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CBSE Class 12 Chemistry 2026 Set 1 (56/5/1) Questions with Solutions
Which of the reactions is used in the conversion of a ketone into hydrocarbon ?
Which of the following reagents are used to prepare primary amines by Hoffmann bromamide degradation reaction ?
(i) \( \text{R}-\text{C}(=\text{O})-\text{NH}_2 \)
(ii) NaOH
(iii) \( \text{Br}_2 \)
(iv) \( \text{CHCl}_3 \)
The major product of carbylamine reaction is :
Actinoids show larger number of oxidation states :
Consider the following reaction and identify A and B :
\( \text{CH}_3\text{Cl} + \text{NaI} \xrightarrow{\text{dry acetone}} \text{A} + \text{B} \)
The correct formula of Hinsberg's reagent is :
Half-life \( (t_{1/2}) \) of a first order reaction is 1386 s. The value of rate constant is :
Which of the following ligands forms a chelate complex ?
Primary, secondary and tertiary alcohols can be distinguished by :
Consider the following compounds :
\( \text{C}_2\text{H}_5\text{NH}_2, (\text{C}_2\text{H}_5)_2\text{NH}, \text{C}_6\text{H}_5\text{CH}_2\text{NH}_2, \text{NH}_3, \text{C}_6\text{H}_5\text{NH}_2 \)
The correct increasing order of the above compounds on the basis of their basic strength is :
Identify the polysaccharide among the following :
The polypeptide chain in a protein has amino acids linked with each other in a specific sequence. This specific sequence of amino acids is called :
Assertion (A) : D (+) – Glucose is dextrorotatory in nature.
Reason (R) : (+) represents dextrorotatory nature and D represents the configuration.
Assertion (A) : Highest oxidation state of Mn is +7 in first series of transition elements.
Reason (R) : Transition metals exhibit variable oxidation states.
Assertion (A) : p-nitrophenol is more acidic than phenol.
Reason (R) : Nitro group is an electron-withdrawing group, it stabilises phenoxide ion by dispersal of negative charge.
Assertion (A) : All aliphatic aldehydes give a positive Fehling’s test.
Reason (R) : Aliphatic aldehydes are reduced by Fehling’s reagent.
1.00 molal aqueous solution of trichloroacetic acid is heated to its boiling point. Boiling point of this solution was found to be \(100.18^\circ C\). Calculate the van't Hoff factor for trichloroacetic acid. (Given : \(K_b\) for water \(= 0.512\;K\,kg\,mol^{-1}\))
State Henry's law. Calculate the mole fraction of \(CO_2\) in water at \(298\,K\) under \(760\,mm\,Hg\). (Given : \(K_H\) for \(CO_2\) in \(H_2O\) at \(298\,K = 1.25 \times 10^6\,mm\,Hg\))
Name the cell which was used in the Apollo space programme for providing electrical power.
Define limiting molar conductivity.
How will you convert nitromethane to methyl isocyanide ?
What are the products obtained on hydrolysis of sucrose ?
What are essential amino acids ?
How will you confirm the presence of five -- OH groups in a glucose molecule, which are attached to different carbon atoms ?
Write any two fat soluble vitamins.
Calculate emf of the following cell at \(298\,K\) : \[ Cr(s)\,|\,Cr^{3+}(aq,\;0.1\,M)\,||\,Fe^{2+}(aq,\;0.01\,M)\,|\,Fe(s) \] (Given : \[ E^\circ_{Cr^{3+}/Cr}=-0.74\,V, \] \[ E^\circ_{Fe^{2+}/Fe}=-0.44\,V, \] \[ \log 10 = 1 \] )
The rate for the following reaction is given by :
\[
A+B \rightarrow C
\]
\[
\text{Rate}=k[A][B]^2
\]
(i) How is the rate of reaction affected if we double the concentration of \(B\) ?
(ii) Write the overall order of a reaction if \(A\) is present in large excess.
Define order of a reaction.
The rate of the chemical reaction doubles when the temperature is raised from \(298\,K\) to \(308\,K\). Calculate activation energy \((E_a)\) for this reaction assuming that it does not change with temperature. (Given : \(R = 8.314\,J\,mol^{-1}\,K^{-1}\), \(\log 2 = 0.30\))
Which type of isomerism is exhibited by the following complex ? \[ [Pt(NH_3)_2Cl_2] \]
Write the IUPAC name of the following complex : \[ K_3[Cr(C_2O_4)_3] \]
Differentiate between homoleptic complex and heteroleptic complex.
A coordination compound \(CrCl_3 \cdot 6H_2O\) is mixed with excess of \(AgNO_3\) solution, two moles of \(AgCl\) are precipitated per mole of the compound. Write the structural formula of the coordination compound.
Write the oxidation state and hybridisation of the central metal in the following complex : \[ [Fe(H_2O)_6]^{3+} \] [Atomic number of Fe = 26]
why is \([Ni(H_2O)_6]^{2+}\) coloured ? [Atomic number of Ni = 28]
How do you convert Acetophenone to Benzoic acid ?
How do you convert Acetonitrile to Acetone ?
An organic compound with the molecular formula \(C_8H_8O\) forms 2,4-DNP derivative, reduces Tollens’ reagent and undergoes Cannizzaro reaction. On vigorous oxidation it gives Benzene-1,2-dicarboxylic acid. Identify the compound and write the reactions of compound with 2,4-DNP and when it undergoes Cannizzaro reaction.
(i) Arrange the following compounds in increasing order of their acidic strengths :
\( \mathrm{CH_3CH(Br)CH_2COOH} \), \( \mathrm{CH_3-CH(CH_3)-COOH} \), \( \mathrm{CH_3CH_2CH(Br)COOH} \)
(ii) Why is \( \mathrm{CH_3CHO} \) more reactive than acetone towards reaction with HCN ?
(iii) Complete the equation :
\( \mathrm{CH_3{-}CH{=}O + NH_2-NH_2 \xrightarrow{H^+}} \)
Ethers are prepared by the dehydration of alcohols in presence of protic acids at 413 K. Symmetrical and unsymmetrical ethers can also be prepared by Williamson synthesis. This reaction involves \( S_N2 \) attack of an alkoxide ion on primary alkyl halide. If a tertiary alkyl halide is used, elimination reaction occurs and an alkene is formed, no ether is formed. C–O bond in ethers are cleaved under drastic conditions with excess of HI. When unsymmetrical ethers react with HI, the alkyl halide is formed from smaller alkyl group. If one of the alkyl group is tertiary, the alkyl halide is formed from the tertiary alkyl group because tertiary alkyl carbocation is more stable than the primary carbocation. Cleavage of alkyl aryl ethers takes place at the alkyl-oxygen bond due to more stable aryl-oxygen bond. The order of reactivity of hydrogen halides is \( \mathrm{HI > HBr > HCl} \). Aromatic ethers undergo electrophilic substitution reactions. The alkoxy group attached to the aromatic ring activates the ring towards electrophilic substitution and directs the incoming group to ortho- and para-positions.
Why is C--O--C bond angle in ethers slightly greater than tetrahedral angle?
Ethers are prepared by the dehydration of alcohols in presence of protic acids at 413 K. Symmetrical and unsymmetrical ethers can also be prepared by Williamson synthesis. This reaction involves \( \mathrm{S_N2} \) attack of an alkoxide ion on primary alkyl halide. If a tertiary alkyl halide is used, elimination reaction occurs and an alkene is formed, no ether is formed. C - O bond in ethers are cleaved under drastic conditions with excess of HI. When unsymmetrical ethers react with HI, the alkyl halide is formed from smaller alkyl group. If one of the alkyl group is tertiary, the alkyl halide is formed from the tertiary alkyl group because tertiary alkyl carbocation is more stable than the primary carbocation. Cleavage of alkyl aryl ethers takes place at the alkyl-oxygen bond due to more stable aryl-oxygen bond. The order of reactivity of hydrogen halides is HI > HBr > HCl. Aromatic ethers undergo electrophilic substitution reactions. The alkoxy group attached to the aromatic ring activates the ring towards electrophilic substitution and directs the incoming group to ortho- and para-positions.
Answer the following questions :
(a) Complete the following equations :
(i) \( \mathrm{C_6H_5{-}OCH_3 + CH_3Cl \xrightarrow[CS_2]{Anhyd.\ AlCl_3}} \)
(ii) \( \mathrm{C_6H_5{-}OCH_3 \xrightarrow{Conc.\ (HNO_3 + H_2SO_4)}} \)
Ethers are prepared by the dehydration of alcohols in presence of protic acids at 413 K. Symmetrical and unsymmetrical ethers can also be prepared by Williamson synthesis. This reaction involves \( \mathrm{S_N2} \) attack of an alkoxide ion on primary alkyl halide. If a tertiary alkyl halide is used, elimination reaction occurs and an alkene is formed, no ether is formed. C - O bond in ethers are cleaved under drastic conditions with excess of HI. When unsymmetrical ethers react with HI, the alkyl halide is formed from smaller alkyl group. If one of the alkyl group is tertiary, the alkyl halide is formed from the tertiary alkyl group because tertiary alkyl carbocation is more stable than the primary carbocation. Cleavage of alkyl aryl ethers takes place at the alkyl-oxygen bond due to more stable aryl-oxygen bond. The order of reactivity of hydrogen halides is HI > HBr > HCl. Aromatic ethers undergo electrophilic substitution reactions. The alkoxy group attached to the aromatic ring activates the ring towards electrophilic substitution and directs the incoming group to ortho- and para-positions.
Answer the following questions :
(b) Write the names of alkyl halide and sodium alkoxide used to prepare tert-butyl ethyl ether.
Ethers are prepared by the dehydration of alcohols in presence of protic acids at 413 K. Symmetrical and unsymmetrical ethers can also be prepared by Williamson synthesis. This reaction involves \( \mathrm{S_N2} \) attack of an alkoxide ion on primary alkyl halide. If a tertiary alkyl halide is used, elimination reaction occurs and an alkene is formed, no ether is formed. C - O bond in ethers are cleaved under drastic conditions with excess of HI. When unsymmetrical ethers react with HI, the alkyl halide is formed from smaller alkyl group. If one of the alkyl group is tertiary, the alkyl halide is formed from the tertiary alkyl group because tertiary alkyl carbocation is more stable than the primary carbocation. Cleavage of alkyl aryl ethers takes place at the alkyl-oxygen bond due to more stable aryl-oxygen bond. The order of reactivity of hydrogen halides is HI > HBr > HCl. Aromatic ethers undergo electrophilic substitution reactions. The alkoxy group attached to the aromatic ring activates the ring towards electrophilic substitution and directs the incoming group to ortho- and para-positions.
Answer the following questions :
(b) Anisole on reaction with HI gives phenol and \( \mathrm{CH_3-I} \) and not methanol and iodobenzene. Justify the statement.
Electrochemistry is the study of the relationship between chemical energy and electrical energy. Many spontaneously occurring chemical reactions liberate electrical energy. In electrolysis, electrical energy is converted directly into chemical energy. The product of an electrolytic reaction depends on the nature of the material being electrolysed and the type of electrode used. Oxidising and reducing species present in the electrolytic cell and their standard electrode potential too, affect the products of electrolysis. Electrolysis plays an important role in most people's daily lives, whether it is for the manufacturing of aluminium, electroplating of metals, or the synthesis of chemical compounds.
Michael Faraday was the first scientist who proposed two laws to explain the quantitative aspects of electrolysis, popularly known as Faraday's laws of electrolysis. Faraday's laws of electrolysis provide a basis for mathematical analysis of the mass deposited at electrodes and the amount of charge passed through them.
Faraday's laws are fundamental in various applications, including electroplating, metal extraction, battery technology and chemical synthesis. These laws also help in environmental monitoring and in various chemistry experiments.
(a) Predict the products of electrolysis in each of the following: (i) An aqueous solution of CuCl\(_2\) with platinum electrodes. (ii) A concentrated solution of H\(_2\)SO\(_4\) with platinum electrodes.
How much charge in faraday is required for the reduction of 1 mol of Ag\(^+\) to Ag?
The following reactions occur at the anode during the electrolysis of aqueous sodium chloride solution: \[ Cl^-_{(aq)} \rightarrow \frac{1}{2}Cl_2(g)+e^- \qquad E^\circ_{\text{cell}}=1.36\,V \] \[ 2H_2O(l) \rightarrow O_2(g)+4H^+(aq)+4e^- \qquad E^\circ_{\text{cell}}=1.23\,V \] Which reaction is feasible at the anode and why?
Electrochemistry is the study of the relationship between chemical energy and electrical energy. Many spontaneously occurring chemical reactions liberate electrical energy. In electrolysis, electrical energy is converted directly into chemical energy. The product of an electrolytic reaction depends on the nature of the material being electrolysed and the type of electrode used. Oxidising and reducing species present in the electrolytic cell and their standard electrode potential too, affect the products of electrolysis. Electrolysis plays an important role in most people's daily lives, whether it is for the manufacturing of aluminium, electroplating of metals, or the synthesis of chemical compounds.
Michael Faraday was the first scientist who proposed two laws to explain the quantitative aspects of electrolysis, popularly known as Faraday's laws of electrolysis. Faraday's laws of electrolysis provide a basis for mathematical analysis of the mass deposited at electrodes and the amount of charge passed through them.
Faraday's laws are fundamental in various applications, including electroplating, metal extraction, battery technology and chemical synthesis. These laws also help in environmental monitoring and in various chemistry experiments.
Answer the following questions :
(b) State Faraday's second law of electrolysis.
Calculate the freezing point of a solution when 10.5 g of MgBr\(_2\) was dissolved in 250 g of water, assuming MgBr\(_2\) undergoes complete dissociation. Given: \[ \text{Molar mass of MgBr}_2 = 184 \, g\,mol^{-1} \] \[ K_f \text{ for water} = 1.86 \, K\,kg\,mol^{-1} \] (ii) Write two differences between ideal and non-ideal solutions.
A solution is prepared by dissolving 0.025 g of potassium sulphate in 2 L of water at 27\(^\circ\)C. Assuming potassium sulphate is completely dissociated, determine its osmotic pressure. Given: \[ R=0.082 \, L\,atm\,K^{-1}mol^{-1} \] \[ \text{Molar mass of }K_2SO_4=174\,g\,mol^{-1} \] (ii) What type of azeotrope will be formed by a solution of acetone and chloroform? Give reason.
(i) (I) Why do transition metals show variable oxidation states? (II) Out of Mn\(^{2+}\) and Ti\(^{2+}\) which will be more paramagnetic and why? Atomic No.: Ti = 22, Mn = 25 (III) Which ion is the strongest oxidising agent in the options given below: \[ Cr^{3+},\ V^{3+},\ Mn^{3+} \] Give reason. Atomic No.: Cr = 24, V = 23, Mn = 25 (ii) Complete and balance the following equations: (I) \[ 2MnO_2+4KOH+O_2\rightarrow ? \] (II) \[ 5C_2O_4^{2-}+2MnO_4^-+16H^+\rightarrow ? \]
(i) What is meant by lanthanoid contraction? (ii) Why do transition metals form coloured compounds? (iii) Why are \(E^\circ_{M^{2+}/M}\) values for Mn and Zn more negative than expected? (iv) Which is the most stable oxidation state of Cu and why? (v) Why is Ce\(^{4+}\) in aqueous solution a good oxidising agent?
(i) (I) Which of the following is more reactive towards S\(_N\)1 reaction: 2-Bromo-2-methylbutane or 1-Bromopentane (II) What type of halide is present in the following compound: \[ \begin{array}{ccccccc} \mathrm{CH_3} & - & \mathrm{CH} & - & \mathrm{C} & = & \mathrm{CH_2}\\ & & | & & | & & \\ & & \mathrm{CH_3} & & \mathrm{Cl} & & \end{array} \] (III) Why is chloroform stored in dark coloured bottles? (ii) Define the following terms: (I) Ambident Nucleophiles (II) Racemic mixture
Answer the following: (a) Which isomer of C\(_4\)H\(_9\)Br is most reactive towards S\(_N\)1 reaction? (b) Predict the alkene that would be formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane. (c) Although chlorine shows strong \(-I\) effect, yet it is ortho- and para-directing in electrophilic aromatic substitution reactions. Why? (ii) Write the major product in the following reactions: (I)
CBSE Class 12 Chemistry Paper Structure
| Question Type | Description |
|---|---|
| Very Short Answer | 1–2 line answers, definitions, or simple equations |
| Short Answer | Explanations, derivations, or numerical problems |
| Long Answer | Detailed answers, reaction mechanisms, or calculations |
| Case-based / Integrated | Questions based on a given situation may include calculations or reasoning |
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