Q.

(A) Gabriel phthalimide synthesis can’t be used for the preparation of aromatic primary amines.
(R) The C – X bond in aryl halides possess partial double bond character and hence X can’t be replaced by pthalimide ion.

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a

Both (A) and (R) are true but (R) is not the correct explanation of (A)

b

Both (A) and (R) are true and (R) is the correct explanation of (A)

c

Both (A) and (R) are false

d

(A) is true but (R) is false

answer is A.

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Detailed Solution

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Gabriel phthalimide reaction is SN2 reaction. Phthalimide anion displaces halide ion from an alkyl halide to form N-alkylphthalimide.In aryl halide due to resonance C-X bond develops partial double bond character and leaving group ability decreases.

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(A) Gabriel phthalimide synthesis can’t be used for the preparation of aromatic primary amines.(R) The C – X bond in aryl halides possess partial double bond character and hence X– can’t be replaced by pthalimide ion.