1.

The correct decreasing order of calorific values is

Answer»

`C_(2)H_(2)gtC_(4)H_(10)gtC_(3)H_(8)gtC_(2)H_(4)`
`C_(4)H_(10)gtC_(3)H_(8)gtC_(2)H_(4)gtC_(2)H_(2)`
`C_(2)H_(4)gtC_(3)H_(8)gtC_(4)H_(10)gtC_(2)H_(2)`
`C_(3)H_(8)gtC_(2)H_(4)gtC_(4)H_(10)gtC_(2)H_(2)`

ANSWER :D


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