Chemistry - STEREO ISOMERISM Question with Solution | TestHub

(A) 3-Methylpent-1-ene: a stereocentre is present (optical isomerism yes) but it is a terminal alkene, so no geometrical isomerism. (B) 2-Methylpent-2-ene: C₂ of the double bond carries two identical CH₃ groups - no geometrical isomerism, and no stereocentre. (C) Pent-2-ene: shows geometrical (E/Z) isomerism, but there is no stereocentre - no optical isomerism. (D) 4-Methylhex-2-ene: the double bond carries two different groups on each carbon (E/Z isomerism) AND C₄ is a stereocentre (H, CH₃, CH₂CH₃, CH=CHCH₃) - it shows both geometrical and optical isomerism.

Ans. (D)