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Q.

Which of the following statements is not correct?

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a

Toluene can be oxidized to benzaldehyde by using alkaline KMnO4.

b

Phenolic aldehydes can be prepared by Reimer-Tiemann reaction

c

NaHSO3 reacts with RCHO in ethanol to give solid adduct having structure

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d

The formation of oximes is hindered at the very low pH

answer is A.

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Detailed Solution

(a) With an alkaline KMnO4, toluene is converted into benzoic acid. However, the use of CrO3 in acetic anhydride followed by hydrolysis will convert toluene to benzaldehyde.
(b) At low pH, protonated aldehydes, ketones and hydroxylamines are formed.

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