CBSE Class 12 Entrepreneurship Question Paper 2016 with Answer Key (April 16)

CBSE CLASS XII Questions

• 1.

  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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• 2.

  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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• 3.

  Why are magnesium blocks attached to iron water pipelines?

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• 4.

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

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• 5.

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

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• 6.

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

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