How many stereoisomers does this molecule have?

Step-by-step solution

Key Idea : (i) Number of optical isomers =2^n where, n= number of dissimilar asymmetric carbon atoms. (ii) Number of geometrical isomers =2^ where, n= number of double bond only when the two ends of the chain are different Here, number of optical isomers =2^1=2 Number of geometrical isomers =2^1=2 Hence, number of stereoisomers =2+2=4