1. Nucleophilic substitution of haloalkane takes place through two dif

1.	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.
Answer» 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.

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.

Answer»

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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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.

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