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Arrange the following alkenes in the increasing order of their heats of hydrogenation: 1.2-methyl butene,2.cis -2pentene,3.3-methyl butene

$\begin{array}{1 1}a)\;1 < 2 < 3\\b)\;2 < 1 < 3\\c)\;3 < 1 < 2\\d)\;3 < 2 < 1\end{array}$

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Alkenes having greater number of carbon atom will have least heats of hydrogenation (2) Among 1 and 3 structure 3 has larger heat of hydrogenation because of isolated or free double bond
Hence (b) is the correct answer.
answered Dec 2, 2013 by sreemathi.v

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