Out of the following compounds,
I. Pent-1-ene, II. Pent-2-ene, III. 2-Methyl but-1-ene IV. 2-Methyl but-2-ene,
Which pair has the lowest and the highest heats of combustion, respectively?

(IV) and (I), respectively

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(I) and (IV), respectively

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(II) and (III), respectively

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(III) and (II), respectively

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Solution

The correct option is A (IV) and (I), respectively

IV. 2-Methyl but-2-ene has the lowest heat of combustion.
I. Pent-1-ene has the highest heat of combustion.
More-stable or more-substituted alkene has the lowest (more negative) heat of combustion, formation and hydrogenation.
Thus, the order of stability of alkenes is IV > III > II > I.

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