Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives:

Which of the following will give benzene when reacted with benzene diazonium chloride?

The final product $[B]$ is :

An organic amino compound reacts with aqueous nitrous acid at low temperature to produce an oily nitroso amine. The compound is:

Identify the products $y$ and $x$ in the following reaction sequence:
$C_6H_5CONH_2 \xrightarrow{NaOBr} y$
$C_6H_5CONH_2 \xrightarrow[(ii) H_3O^+]{(i) C_6H_5SO_2Cl / py, \Delta} x$

Which of the following is the weakest base?