Propose mechanisms and show the expected products of the following reactions. (a) 2, 4-dinitrochlorobenzene + sodium methoxide

Question:

Propose mechanisms and show the expected products of the following reactions.
(a) 2, 4-dinitrochlorobenzene + sodium methoxide (NaOCH3)
(b) 2, 4-dimethylchlorobenzene + sodium hydroxide, 350 oC
(c) p-nitrobromobenzene + methylamine (CH3 - NH2)
(d) 2, 4-dinitrochlorobenzene + excess hydrazine (H2N - NH2)