Which pair of compound his homologue ?

In the given pair of compounds, in which pair second compound has higher boiling point than first compound ?

Among the given pairs, in which pair secod compound has less enol content than first compound?

Among the given pairs, in which pair second compound has less enol content than first compound?

In the the given pair of compound , in which pair the second compound is more reaction than first toward S_(N^(2)) reaction ?

Which of the following is the homologue of butene?