[Solution] $C_4H_{10}O$ forms ethers with different alkyl groups on either side of O (e.g. $C_2H_5OC_2H_5$ and $CH_3OC_3H_7$), i.e. metamers. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.