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Use the following data to answer the que...

Use the following data to answer the question below.

Calculate the resonance energy of anthracene:

A

A) 84 kcal/mol

B

B) 100 kcal/mol

C

C) 110 kcal/mol

D

D) 116 kcal/mol

Text Solution

Verified by Experts

The correct Answer is:
A
(a) Resonance energy = Theoretical heat of hydrogenation - Experimental heat of hydrogenation.
`DeltaH=28.6 "kcal/mol"`
So theoretical heat of hydrogenation (H.O.H.) for anthracene is

Theoretical `DeltaH = 7xx(-28.6) =-200.2 "kcal/mol"`
Experimental `DeltaH` =-116.2 kcal/mol
Resonance energy = 84 kcal/mol
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