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Q.

Enthalpies of formation of ethane, ethyene and benzene from the gaseous atoms are e- 2839.2, -2275.2 and −5536 kJ mol−1, respectively. Bond enthalpy of C-H is 410.87 kJ mol−1. The bond enthalpy of C=C is

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a

613.2 kJ mol−1

b

631.72 kJ mol−1

c

662.4 kJ mol−1

d

650.1 kJ mol−1

answer is B.

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Detailed Solution

εC−C=Enthalpy to break C2H4 into gaseous atoms −4×εC−H

=(2275.2−4×410.87)kJ mol−1=631.72 kJ mol−1

Thus the correct option is B.

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