Which of the following on combustion gives maximum energy?

Ethane

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Propane

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Methane

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Butane

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Solution

The correct option is C Butane
Equation for combustion of alkanes is as follows
$C_{n} H_{2 n + 2} + (\frac{3 n + 1}{2}) O_{2} \to n C O_{2} + (n + 1) H_{2} O + H e a t$
Greater the value of n greater will be the heat produced. Therefore, on combustion butane gives maximum energy.

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