Q.

Use the bond energies in the table to estimate H for this reaction.

H2C=CH2+Cl2ClH2CCH2Cl

Bond Energies  C-C347 kJ mol-1C=C612 kJ mol-1C-Cl331 kJ mol-1C-H414 kJ mol-1Cl-Cl243 kJ mol-1

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a

ΔH=684 kJ

b

ΔH=+89 kJ

c

ΔH=+177 kJ

d

ΔH=154 kJ

answer is B.

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Detailed Solution

ΔH=(612+4×414+243)

(4×414+2×331×347)

=-154 KJ

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