Question

Predict the number of stereoisomers for 2,5-heptadiene :

• A. 4
• B. 3
• C. 2
• D. 5

Answer 1

The correct option is B 3

Terminal groups are the same.The number of double bonds is two (even number).

$\therefore$ Number of GI=$2^{n-1}+2^{(n-2)/2}=2^1+2^0=2+1=3$

where n is the number of double bonds.