Which of the following structures is correct?

Which of the following structures is correct?

A
The structure of the intermediate product, formed by the oxidation of toluene with CrO3 and acetic anhydride, whose hydrolysis gives benzaldehyde, is C6H5CH2OCOCH3.
B
The carbon-carbon bond length in benzene is 139 pm.
C
Cyclopentadienyl anion has unusually low stability.
D
Cycloheptatrienyl cation is also known as tropylium ion

Solution:

(a) The intermediate is $C_{6} H_{5} CH {({OCOCH}_{3})}_{2}$ , benzylidene acetate

(c) Cyclopentadienyl anion has high stability

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