1.

If Delta_fH°(C_2H_4)and Delta_fH°(C_2H_6)| are in x_1| and x_2 kcalmol ^(-1),then heat of hydrogenation of C_2H_4 will be

Answer»

`x_1+x_2`
`x_1-x_2`
`x_2-x_1`
`x_1+2x_2`

ANSWER :C


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