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in Haloalkanes and Haloarenes by (26.7k points)
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1. Nucleophilic substitution of haloalkane takes place through two different mechanisms, SN1 and SN2 . Why do inversion of conguration take place in SN2 ?

2. What is racemic mixture?

3. Comment on the optical activity of recemic mixture.

1 Answer

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1. is because the nucleophile attaches itself on the side opposite to the one where the halogen atom is present.

2. Equimolar mixture of ‘d’ and T forms of an optically active compound is called racemic mixture.

3. Racemic mixture is optically inactive due to external compensation. A mixture containing two enantiomers in equal proportions will have zero optical rotation, as the rotation due to one isomer will be cancelled by the rotation due to the other isomer.

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