What is the order of heat of combustion of the following ? (i) Heptane (ii) Pentane (iii) 2-Methyl pentane (iv) 2, 2-Dimethyl butane
A
(i) > (ii) > (iii) > (iv)
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B
(iv) > (iii) > (ii) > (i)
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C
(i) > (iii) > (iv) > (ii)
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D
(i) > (iii) > (ii) > (iv)
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Solution
The correct option is C (i) > (iii) > (iv) > (ii) More the number of carbon atoms, more will be the heat of combustion. For compounds of same number of carbon atoms heat of combustion decreases with increase in branching. Heptane - 7 carbon atoms Pentane - 5 carbon atoms 2-Methyl pentane - 6 carbon atoms and 1 branching 2, 2-Dimethyl butane - 6 carbon atoms and 2 branching Hence, the order of heat of combustion is (i) > (iii) > (iv) > (ii)