1.

An optically active alkene with the molecular fomula C_(6) CH_(12) which upon hydrogenation gives optically inactive alkane is

Answer»

2 - hexane
3 - methyl - 2- PENTENE
2 - methyl -2- pentene
3 - methyl-1-pentene

Solution :Since an optically active alkene upon hydrogenation gives optically inactive alkane, therefore alkane has two IDENTICAL GROUPS, i.e. `C_(2) H_(5)` groups while alkene has one vinyl `(CH_(2) = CH)` and one ethyl group. THUS the structure of alkene is 3-methyl-1-pentene.
`CH_(2) = CH underset("optically active")overset(CH_(3))overset(.|)(- CH-) CH_(2) CH_(3) overset(H_(2)//Pl)(rarr )CH_(3) CH_(2) underset("optically inactive")overset(CH_(3))overset(|)(- CH - ) - CH_(2) CH_(3)`


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