Which of the following compounds does not exhibit optical isomerism?

Step-by-step solution

Optical isomerism requires chirality, typically from a chiral carbon bonded to four distinct groups. 3-Iodohexane has a chiral carbon at position 3 bonded to -H, -I, -CH 2 CH 3 , and -CH 2 CH 2 CH 3 , so it exhibits optical isomerism. 2-Iodopentane has a chiral carbon at position 2 bonded to -H, -I, -CH 3 , and -CH 2 CH 2 CH 3 , so it exhibits optical isomerism. 2-Iodo-2-methylbutane has a carbon at position 2 bonded to -I, -CH 3 , another -CH 3 , and -CH 2 CH 3 . With two identical methyl groups, it is not chiral