Question

The molecular formula of the third member of the homologous series of ketones is:
(a) C₄H₈O
(b) C₃H₆O
(c) C₅H₁₀O
(d) C₆H₁₂O

Answer 1

C₅H₁₀O
The molecular formula of the third member from the homologous series of ketones is C₅H₁₀O (Pentanone or C₂H₅-CO-C₂H₅).