CBSE Class 12 Chemistry Question Paper 2023 with Answer Key (February 28, Set 5 -56(B))

CBSE CLASS XII Questions

• 1.

  Give structures of A, B and C: $CH_3Cl \xrightarrow{KCN}$ A $\xrightarrow{LiAlH_4}$ B $\xrightarrow{CHCl_3 + \text{alc. } KOH, \Delta}$ C

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• 2.

  61 g benzoic acid (M = 122 g mol$^{-1}$) dissolved in 500 g benzene. Vapour pressure of pure benzene = 66 torr. Assume complete dimerisation. Calculate vapour pressure of solution.

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• 3.

  Though chlorine shows strong $-I$ effect, why is it ortho/para directing?

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• 4.

  Which isomer of $C_4H_9Br$ is most reactive towards $S_N1$ reaction?

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• 5.

  Predict the alkene that would be formed by dehydrohalogenation of 1-Bromo-1-methylcyclohexane.

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• 6.

  Give structures of A, B and C: Aniline $\xrightarrow{Br_2/H_2O}$ A $\xrightarrow{NaNO_2+HCl, 0-5^\circ C}$ B $\xrightarrow{H_3PO_2+H_2O}$ C

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