The number of stereoisomers possible for a compound of the molecular formula $\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}(\mathrm{OH})-\mathrm{Me}$ is:

• A

  2
• Correct answer
  B

  4
• C

  6
• D

  3

Solution

exhibits both geometrical as well as optical isomerism. $\begin{array}{ll}c i s-\mathrm{R} & \text { cis }-\mathrm{S} \\ \text { trans }-\mathrm{R} & \text { trans }-\mathrm{S}\end{array}$

Hence, the correct answer is option: 'B'.