1.

Which one of the following compounds would have the highest heat of hydrogenation ?

Answer»

`CH_(2)=CH_(2)`
`CH_(3)-CH_(2)-CH=CH_(2)`
`CH_(3)CH=CHCH_(3)`
`(CH_(3))_(2)C-C(CH_(3))_(2)`

Solution :The HEAT ofhydrogenation of an alkene depends UPON its stability. Higher the stability, lower the heat of hydrogenation. Since `CH_(2)=CH_(2)` has no substituent, it is the LEAST stable alkene and HENCE has the highest heat of hydrogenation.


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