Given below are isomeric amines. The incorrect statement or statements about them from the following is or are

A

(p) and (q) both will give unstable products respectively with $$\text{NaNO}_2$$ in HCl at 268 K

B

Reaction of all amines with HCl is exothermic

C

Reaction of benzene sulphonyl chloride with (s) gives a solid product that is soluble in NaOH

D

(q) has the highest basicity among these