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Which of the following substance on treatment with `NaNH_(2)` in liquid `NH_(3)` gives m-anisidine

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Which of the following substance on treatment with `NaNH_(2)` in liquid `NH_(3)` gives m-anisidine
A. o-Bromoanisole
B. m-Bromoanisole
C. p-Bromoanisole
D. None of these
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Correct Answer - A::B
Nucleophilic substitution in the pressence of a strong base like `NaNH_(2)` takes place through elimination-addition or benzyne mechanism as explained below.
image
In this reaction both o-and m-bromonaisole give the same benzyne intermediate which on the addition of `NH_(3)` gives m-anisidine.
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