What is the monomer unit of neoprene?

Which of the following compounds is an addition polymer?

The structural formula of benzene is:

Which of the following polymer substances is inert towards environmental processes?

Match the reactions given in Column $(A)$ with the names given in Column $(B).$

Column $(A)$	Column $(B)$
$(a)$ $CH_{3}OH + CH_{3}COOH \xrightarrow{H^{+}} CH_{3}COOCH_{3} + H_{2}O$	$(i)$ Addition reaction
$(b)$ $CH_{2}=CH_{2} + H_{2} \xrightarrow{Ni} CH_{3}-CH_{3}$	$(ii)$ Substitution reaction
$(c)$ $CH_{4} + Cl_{2} \xrightarrow{\text{Sunlight}} CH_{3}Cl + HCl$	$(iii)$ Neutralisation reaction
$(d)$ $CH_{3}COOH + NaOH \longrightarrow CH_{3}COONa + H_{2}O$	$(iv)$ Esterification reaction

Complete the following chemical reactions and write the chemical name of the products obtained.
$(i)$ $CH_{2}=CH_{2} + H_{2}O \longrightarrow$
$(ii)$ $CH_{3}COOH + NaOH \longrightarrow$
$(iii)$ $CH_{3}CH_{2}OH \xrightarrow{H_{2}SO_{4}} $
$(iv)$ $HCOOH + Na \longrightarrow$
$(v)$ $C_{2}H_{5}OH \xrightarrow{\text{Alk. } KMnO_{4}} $