CBSE Class 12 Physics Question Paper 2019 with Answer Key (March 5, Set 3- 55/2/3)

CBSE CLASS XII Questions

• 1.

  Draw the structures of major products: (a) Chlorobenzene + $CH_3Cl$ / Na, dry ether
  (b) p-Hydroxyphenethyl alcohol + HBr

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• 2.

  What are reducing sugars?

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• 3.

  Why is o-nitrophenol more acidic than o-methoxyphenol?

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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.

  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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• 6.

  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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