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Q.

Consider the following statements about benzene.
I. Heats of hydrogenation of benzene and 1,3,5-cyclohexatriene are identical.
II. Benzene is much more stable than expected for 1,3,5-cyclohexatriene.
III. All carbon-carbon bonds (single and double) have equal length.
Select the correct statements.

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a

I and II

b

II and III

c

I and III

d

I, II and III

answer is B.

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Detailed Solution

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II. Based on heat of hydrogenation, benzene is more stable than 1.,3,5-cyclohexatriene by - 85.2 - (-49.3)
= - 35.9 kcal.
Thus, II is correct.
III Due to resonance all (C-C) and (C=C) bonds have equal length.
Thus, III is also correct.
Thus, II and III are correct.
 

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Consider the following statements about benzene.I. Heats of hydrogenation of benzene and 1,3,5-cyclohexatriene are identical.II. Benzene is much more stable than expected for 1,3,5-cyclohexatriene.III. All carbon-carbon bonds (single and double) have equal length.Select the correct statements.