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Question

The correct order of heats of combustion of above compounds is:

A
I > II > III
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B
II > I > III
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C
III > II > I
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D
III > I > II
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Solution

The correct option is C III > II > I
The heat of combustion is the heat produced when one mole of a substance is completely burnt in oxygen under standard conditions.
Heat of combustion is directly proportional to the number of carbon atom for non-isomeric compound.
Here, compound (I) cyclopropane has 3 carbon cyclic chain.
Compound (II) cyclobutane has 4 carbon cyclic chain and compound (III) cyclopentane has 5 carbon cyclic chain.
Thus, the order of heat of combustion is,
III > II > I

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