(c) Two isomers $CH_{3} - CH - CH_{3}$ | $\ \ \ \ \ \ \ \ \ \ \ \ CH_{3}$ Iso-butane $CH_{3} - CH_{2} - CH_{2} - CH_{3}$ n-butane
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.