Question

How many stereoisomers are possible for the following molecule ?

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer 1

The correct option is D $4$

The given compound is alkylidene cycloalkane.
Here, the terminal double bond shows geometrical isomerism and alkylidene cycloalkane part shows optical isomerism due to the lack of symmetry in the molecule.


So, the total number of stereoisomers available for the given compound is 4.
They are
(i). R, cis
(ii). R, trans
(iii). S, cis
(iv). S, trans