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Which of the following is best fuel? Giv...

Which of the following is best fuel? Given heats of combustion of `CH_4, C_2H_4, C_2H_2` and `C_2H_6` are -891, -1412, 1299, -1550 kJ `mol^(-1)

A

`C_2H_2`

B

`C_2H_6`

C

`CH_4`

D

`C_2H_4`

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