Q.

Which of the following structures is correct?

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a

Cyclopentadienyl anion has unusually low stability.

b

The structure of the intermediate product, formed by the oxidation of toluene with CrO3 and acetic anhydride, whose hydrolysis gives benzaldehyde, is C6H5CH2OCOCH3.

c

Cycloheptatrienyl cation is also known as tropylium ion

d

The carbon-carbon bond length in benzene is 139 pm.

answer is B.

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Detailed Solution

(a) The intermediate is C6H5CH(OCOCH3)2, benzylidene acetate 

(c) Cyclopentadienyl anion has high stability

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