Here pls explain there are only 2 products obtained then how answer is 2 and 4. The number of structural and configurational isomers of C5H9Br formed by the addition of Hbr to 2-pentyne are?

The number of structural and configurational isomers of C5H9Br formed by the addition of HBr 2-pentyne are





Each of these structural isomer give two configurational isomer form E and  Z. Hence, total of 4 configurational isomer are present along with 2 structural isomer .
 

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