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  4. Predict the number of stereoisomers for 2,5-heptadiene

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Q. Predict the number of stereoisomers for 2,5-heptadiene

Organic Chemistry – Some Basic Principles and Techniques

Solution:

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Terminal groups are same. The number of double bonds is two (even number)
$\therefore$ Number of G.I. $=2^{n-1}+2^{(n-2) / 2}=2^1+2^0=$ $2+1=3$
When $n$ is the number of double bonds