Which of the following mechanisms of action occur when there are electron withdrawing
groups on the aromatic ring during nucleophilic substitution ?
A) SN
B) ArsN
C) Benzyne
D) SRN
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The correct option is B :
Explanation: Its the SNAr mechanism which occurs when electron withdrawing groups are present near the aromatic ring, favouring the Nucleophilic reaction to take place.
SNAr mechanism: It refers to addition of a Nucleophile, leading to destroying of aromaticity of a ring, followed by an elimination reaction.
Nucleophilic Reaction: It refers to a reaction where electron rich nucleophile substitutes proton rich electrophile.
Nucleophile: electron rich specie. For example OH-, Cl- etc.
Elctrophile: proton rich specie. For example H3O+ etc.
Explanation: Its the SNAr mechanism which occurs when electron withdrawing groups are present near the aromatic ring, favouring the Nucleophilic reaction to take place.
SNAr mechanism: It refers to addition of a Nucleophile, leading to destroying of aromaticity of a ring, followed by an elimination reaction.
Nucleophilic Reaction: It refers to a reaction where electron rich nucleophile substitutes proton rich electrophile.
Nucleophile: electron rich specie. For example OH-, Cl- etc.
Elctrophile: proton rich specie. For example H3O+ etc.
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