Question

How many stereoisomers does this molecule have?
$C{H}_{3}CH=CHC{H}_{2}CHBrC{H}_3$

• A. 4
• B. 6
• C. 8
• D. 2

Answer 1

Answer: (A)

C${}^{\bullet }$ = asymmetric carbon
Number of optical isomers = 2${}^n$
where, n = number of asymmetric carbon atoms
$2^1=2$
Number of geometrical isomers = $2^n$ where, n = number of double bonds = $2^1=2$
Hence, total number of stereoisomers = Total
optical isomers 4- Total geometrical isomers
$=2+2=4$