CBSE Class 12 Biotechnology Question Paper 2019 with Answer Key (March 7)

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.

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

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• 3.

  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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• 4.

  Write mechanism of acid dehydration of ethanol to ethene.

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• 5.

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

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• 6.

  Under what condition can a bimolecular reaction become kinetically first order?

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