The number of structural and configurational isomers ofa bromo compound , C_5H_9Br formed by the addition of HBr to 2-pentyne respectively are :

The number of structural and configurational isomers ofa bromo compoun

1.	The number of structural and configurational isomers ofa bromo compound , C_5H_9Br formed by the addition of HBr to 2-pentyne respectively are :
Answer» 1 and 2 2 and 4 4 and 2 2 and 1 Solution :Markovnikov's and anti-Markovnikov's ADDITION of HBr gives TWO structural isomers, i.e., `CH_3C-=C CH_2CH_3 overset"HBr"to CH_3CH=C(Br)CH_2CH_3 + CH_3C(Br)=CHCH_2CH_3` Each of these two isomers can exist as a PAIR of cis, trans-isomers and HENCE there are four configurational isomers.