Which compounds is Homologue of following CH3−CH|CH3−CH|CH3−C||O−CH3

[Step 1]:Homologous series is series of compounds having same functional group and  chemical properties which differ by on  -CH2 group.[Step 2]:The molecular formula of given compound is C7H14O molecular formula of option  (1), (2), and (3) are  C7H14OIn option (4), molecular formula of compound is C8H16O.