Question

Give brief note on $S_{{N}^{1}}$ and $S_{{N}^{2}}$ reaction.

Answer 1

Answer :

$S_{{N}^{1}}$ reaction -

⇒ It stands for unimolecular nucleophilic substitution reaction.

⇒ Rate of reaction depends only upon the concentration of alkyl halide.

⇒ It has two step mechanism.

⇒ In this, carbocation is formed.

⇒ In $S_{{N}^{1}}$ reaction, nucleophile attacks from either side.

⇒ In this, enantiomeric pair is formed.

⇒ It will get favoured in presence of polyprotic solvent.

$S_{{N}^{2}}$ reaction -

⇒ It stands for biimolecular nucleophilic substitution reaction.

⇒ Rate of reaction depends only upon the concentration of alkyl halide as well as nucleophile.

⇒ It has one step mechanism.

⇒ In this, transition state is formed.

⇒ In $S_{{N}^{2}}$ reaction, nucleophile attacks from back side.

⇒ In this, inversion of configuration takes place which is known as Walden inversion.

⇒ It will get favoured in presence of polyaprotic solvent.

Answer 2

Explanation:

S¹reaction -

⇒ It stands for unimolecular nucleophilic substitution reaction.

⇒ Rate of reaction depends only upon the concentration of alkyl halide.

⇒ It has two step mechanism.

⇒ In this, carbocation is formed.

reaction, nucleophile attacks from either side.

⇒ In this, enantiomeric pair is formed.

⇒ It will get favoured in presence of polyprotic solvent.

S² reaction -

⇒ It stands for biimolecular nucleophilic substitution reaction.

⇒ Rate of reaction depends only upon the concentration of alkyl halide as well as nucleophile.

⇒ It has one step mechanism.

⇒ In this, transition state is formed.

reaction, nucleophile attacks from back side.

⇒ In this, inversion of configuration takes place which is known as Walden inversion.

⇒ It will get favoured in presence of polyaprotic solvent.