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(C) Statement $A$ is incorrect: Benzene diazonium chloride is stable only at low temperatures $(273-278 \ K)$. At $285 \ K$,it is unstable and decompo

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$B$ only

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(C) Statement $A$ is incorrect: Benzene diazonium chloride is stable only at low temperatures $(273-278 \ K)$. At $285 \ K$,it is unstable and decomposes.Statement $B$ is correct: The $-NHCOCH_3$ group in $N$-phenylethanamide is electron-withdrawing due to resonance with the carbonyl group,making the ring less electron-rich compared to the $-NH_2$ group in aniline. Thus,it is less reactive towards electrophilic substitution like nitration.Statement $C$ is incorrect: Hinsberg reagent is benzenesulphonyl chloride $(C_6H_5SO_2Cl)$,not $p-CH_3C_6H_4COCl$.Therefore,only statement $B$ is correct.

The correct statements of the following are:
$A$. Aniline forms a stable benzene diazonium chloride at $285 \ K$.
$B$. $N$-Phenylethanamide is less reactive towards nitration than aniline.
$C$. $p-CH_3C_6H_4COCl$ is Hinsberg reagent.

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The correct statements of the following are:$A$. Aniline forms a stable benzene diazonium chloride at $285 \ K$.$B$. $N$-Phenylethanamide is less reactive towards nitration than aniline.$C$. $p-CH_3C_6H_4COCl$ is Hinsberg reagent.