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The enthalpy of hydrogenation for 1-pent...

The enthalpy of hydrogenation for 1-pentene is +126 kJ/mol. The enthalpy of hydrogenation for 1, 3-pentadiene is +230 kJ/mole. Hence estimate the resonance energy of 1, 3-pentadiene.

A

`-22 kJ`

B

`-104 kJ`

C

`-252 kJ`

D

Cannot be calculated from this information

Text Solution

Verified by Experts

The correct Answer is:
A
`C_(5)H_(10) + H_(2) rarr C_(5)H_(12) " "Delta H = + 126 kJ//"mole"`
`Delta H_(th) = 2 xx 126 kJ//"mole" = 252 kJ//"mole"`
`RE = 230 - 252 = -22 kJ//"mole"` .
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