Assertion- Chlorobenzene is less reactive towards nucleophilic substitution reactions . Reason- Chlorine is a deactivating group.
Answers
Explanation:
Chlorobenzene is extremely less reactive towards a nucleophilic substitution reaction.
Chlorine shows two effects viz. +R effect and -I effect.
Nucleophilic substitution reaction
That substitution reaction which are carried out by a Nu
⊝
For eg:
R−X+Nu
⊝
→R−Nu+X
−
A nucleophile is an e
−
rich species so it attacks on that compound which is e
−
deficient to donate its electron.
1) Resonance Effect:
Some pair of e
−
on chlorine is in resonance effect with the benzene ring a which increases the e
−
density on the benzene ring.
Due to the resonance effect, there is increased e
−
density on the benzene ring. The e
−
density repels the incoming Nu to attack the benzene ring.
2) Because of the development of partial double - bond character, the nucleophile cannot leave the C=Cl bond for substitution.
Therefore, chlorobenzene is less reactive towards Nu substitution reaction.
Answer:
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