Q11 of 40 Page 1

Give reasons:

reactions are accompanied by racemization in optically active alkyl halides.

In the case of SN1 reaction, there is formation of carbocation as an intermediate which has sp2 hybridisation and a planar structure. This planar carbocation is attacked by nucleophile from both the sides equally to form d and l isomers in equal proportion and these products are called racemic mixture. Hence SN1 reactions are accompanied by racemization in optically active alkyl halides.


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11

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11

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The dipole moment of chlorobenzene is lower than that of cyclohexyl chloride.

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An element crystallizes in a f.c.c. lattice with cell edge of 250 pm. Calculate the density if 300 g of this element contain atoms.

 13

The rate constant for the first order decomposition of H2O2 is given by the following equation:


Calculate for this reaction and rate constant k if its half-life period be 200 minutes.


(Given: )