(i) This is an example of neutralization reaction

CH₃COOH + NaOH → CH₃COONa + H₂O

(ii)

(iii) Alcohols will get oxidised to acids in the presence of MoO₃ which is an oxidising agent. In this case, methanol (CH₃OH) gets oxidised to methanoic acid (HCOOH).

(iv) CH₂ = CH₂ + Br → CH₂Br—CH₂Br

This is an example of addition reaction.

(v) CH₃COOC₂H₅ + NaOH → CH₃COOH + C₂H₅OH

This is an example of saponification reaction and is used in the preparation of soaps.

(vi)

This is an addition reaction, where H⁺ is added to one of the carbon and OH^- is added to the other carbon.