Primary and secondary amines are distinguished by

Which of the following cannot give the carbylamine reaction?

$A$ positive carbylamine test is given by :-
$(a)$ $N,N$-Dimethylaniline
$(b)$ $2,4$-Dimethylaniline
$(c)$ $N$-methyl-$o$-methylaniline
$(d)$ $p$-Methylbenzylamine

Which of the following amine$(s)$ show$(s)$ positive carbylamine test?
$A. CH_3CH_2NH_2$
$B. (CH_3)_2NH$
$C. CH_3NH_2$
$D. (CH_3)_3N$
$E. C_6H_5NH_2$
Choose the correct answer from the options given below:

Which of the following amines forms a clear solution when treated with benzene sulphonyl chloride and excess of potassium hydroxide?

Secondary nitro compounds when react with $HNO_2$ form crystalline solids which on treatment with $NaOH$ give