Question

Optical isomerism is shown by

• A. propanol-2
• B. butanol-2
• C. ethanol
• D. methanol

Answer 1

Answer: (B)

Optical isomerism is shown by an asymmetric carbon atom which has a carbon atom attached to four different atoms or groups. So, butanol-$2$ is optically active.
$\underset{\text{butanol-2}}{H_{3}C-C{H}_2-\underset{\stackrel{|}{O}H}{\stackrel{\underset{|}{H}}{C}}-C{H}_3}$