Assertion : The presence of nitro group facil | vedclass

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Question

(A) The nitro group $(-NO_2)$ is a strong electron-withdrawing group $(-EWG)$.In nucleophilic aromatic substitution,the rate-determining step is the f

Vedclass · Accepted Answer

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

Vedclass · Answer

(A) The nitro group $(-NO_2)$ is a strong electron-withdrawing group $(-EWG)$.In nucleophilic aromatic substitution,the rate-determining step is the formation of a resonance-stabilized carbanion intermediate (Meisenheimer complex).The $-NO_2$ group stabilizes this intermediate carbanion by dispersing the negative charge through resonance and inductive effects.Therefore,the presence of a nitro group at ortho or para positions significantly facilitates nucleophilic substitution reactions in aryl halides.Thus,both the Assertion and the Reason are correct,and the Reason is the correct explanation of the Assertion.

Assertion : The presence of nitro group facilitates nucleophilic substitution reactions in aryl halides.
Reason : The intermediate carbanion is stabilized due to the presence of nitro group.

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Assertion : The presence of nitro group facilitates nucleophilic substitution reactions in aryl halides.Reason : The intermediate carbanion is stabilized due to the presence of nitro group.