1.

Heat of dissociation of benzene to elements is 5535 KJ mol^(-1). The bond enthalpies of C - C, C = C and C - H are 347.3, 615.0 and 416.2 KJ respectively. Resonance energy of benzene is

Answer»

1.51 KJ
15.1 KJ
151 KJ
1511 KJ

SOLUTION :
`Delta H_("Calculated")=Sigma (B.E.)_(R )-Sigma (B.E.)_(P)`
`Delta H_("Cal")=[3XX(B.E.)_(C=C)+6XX(B.E.)_(C-H)+3xx(B.E.)_(C-C)]-0`
`Delta H_("Cal")=[3xx(615)+6xx(416.2)+3xx(347.33)]`
`Delta H_("Calculated")=5384.1 KJ mol^(-1)`
RESONANCE energy `=Delta H_("Observed")-Delta H_("Calculated")`
`=5535-5384.1`
Resonance energy `~= 151 KJ`


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