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The decreasing order of calorific values...

The decreasing order of calorific values is

A

`C_2H_2gtC_4H_(10)gtC_3H_8gtC_2H_4`

B

`C_4H_(10)gtC_3H_8gtC_2H_4gtC_2H_2`

C

`C_2H_4gtC_3H_8gtC_4H_(10)gtC_2H_2`

D

`C_3H_8gtC_2H_4gtC_4H_(10)gtC_2H_2`

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