CBSE Class 12 Chemistry Question Paper 2010 Delhi Set 56 1

CBSE CLASS XII Questions

• 1.

  (a) Write two structural differences between DNA and RNA.

  (b) Which component of starch is a branched chain polymer of \( \alpha \)-D-(+)-glucose ? Write its one characteristic feature.

  (c) Which types of bonds hold the polypeptide chains in fibrous proteins ?

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• 2.

  Match Column I with Column II and choose the correct option :

  Column I	Column II
  a. Osmotic pressure	i. \( \Delta \mathrm{T_f} = \mathrm{K_f}\,m \)
  b. Elevation of boiling point	ii. \( \pi = CRT \)
  c. Depression of freezing point	iii. \( \frac{\mathrm{P_1^0 - P_1}}{\mathrm{P_1^0}} = \frac{\mathrm{W_2 \times M_1}}{\mathrm{M_2 \times W_1}} \)
  d. Relative lowering of vapour pressure	iv. \( \Delta \mathrm{T_b} = \mathrm{K_b}\,m \)

  • a-i, b-ii, c-iii, d-iv
  • a-ii, b-i, c-iii, d-iv
  • a-iv, b-iii, c-ii, d-i
  • a-ii, b-iv, c-i, d-iii
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• 3.

  Write the reactions taking place at anode and cathode in a lead storage battery, when it is in use.

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• 4.

  Explain the Finkelstein reaction.

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• 5.

  (i) (I) The \(\mathrm{pK_b}\) value of aniline is higher than that of methylamine. Explain why.

  (II) Arrange the following compounds in decreasing order of their basic strength in the gaseous phase :

  \(\mathrm{NH_3}\), \(\mathrm{(C_2H_5)_2NH}\), \(\mathrm{(C_2H_5)_3N}\), \(\mathrm{C_2H_5NH_2}\)

  (III) What is Hinsberg's reagent ? Mention its one use.

  (ii) How will you convert the following :

  (I) Nitrobenzene to Benzenediazonium chloride ?

  (II) Iodomethane to Ethanamine ?

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• 6.

  An organic compound (X) has the molecular formula \(C_5H_{10}O\). Draw structures for (X) if it:
  (I) does not give Tollen's test but gives a positive iodoform test.
  (II) does not give Tollen's test and iodoform test but undergoes Aldol condensation.
  (III) undergoes Cannizzaro's reaction.
  

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