CBSE Class 12 Biology Question Paper 2023 with Answer Key (March 16, Set 5 - 57(B))

CBSE CLASS XII Questions

• 1.

  Write mechanism of acid dehydration of ethanol to ethene.

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• 2.

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

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• 3.

  Why are magnesium blocks attached to iron water pipelines?

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• 4.

  Explain: (i) Presence of carbonyl group in glucose. (ii) Presence of five $-$OH groups attached to different carbon atoms.

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• 5.

  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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• 6.

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

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