Identify the monomer used in preparation of polyacrylonitrile?

Identify the product ' B ' in following reaction.

Ethanal $\xrightarrow{\text { dil } \mathrm{NaOH}} A \xrightarrow[\mathrm{H}_2 \mathrm{O}]{\Delta} B$

What are the positions of ' N ' atoms present in pyrimidine ring of nucleic acids?

Identify the major product obtained when anisole reacts with bromine in acetic acid.