KCET · Chemistry · Hydrocarbons

Which one of these is not true for benzene?

A It forms only one type of monosubstituted product
B There are three carbon-carbon single bonds and three carbon-carbon double bonds
C Heat of hydrogenation of benzene is less than its theoretical value
D The bond angle between carbon-carbon bonds is \(120^{\circ}\)

Verified Solution

Answer & Solution

Correct Answer

(B) There are three carbon-carbon single bonds and three carbon-carbon double bonds

Step-by-step Solution

Detailed explanation

Benzene does not contain 3 single bonds and 3 double bonds. These are all partially double due to resonance.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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