CBSE Class 12 · 2005 · All India · Compounds Containing NitrogenShort Answer

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i) Stating the necessary reaction conditions, write chemical equations to obtain chlorobenzene from aniline.
ii) Identify A and B in the two sequences shown in the figure.

Answer: (i) Diazotise (0–5 °C), then Sandmeyer with CuCl/HCl. (ii) Per the printed lines.

Solution

(i)

C_{6} H_{5} N H_{2} NaN O_{2} + 2HCl, 273 - 278K C_{6} H_{5} N_{2}^{+} C l^{-} CuCl/HCl C_{6} H_{5} Cl + N_{2}

(ii) Each printed sequence: apply the shown reagents stepwise (diazotisation, then replacement/coupling) and name the intermediates A and B.

CBSE Class 12 Board · 2005 · All India · Subjective

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