COMEDK · Chemistry · 26. Alcohols Phenols and Ethers

Which of the following is incorrect?

A Primary alcohols are very easily oxidised to aldehydes, which are oxidised to acids with same number of C-atoms.
B Secondary alcohols are very easily oxidised to ketones, which are oxidised to acids with same number of C-atoms.
C Secondary alcohols are easily oxidised to ketones, which are oxidised to acids with lesser number of C-atoms.
D Secondary and tertiary alcohols on oxidation form acids with lesser number of C-atoms.

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Answer & Solution

Correct Answer

(B) Secondary alcohols are very easily oxidised to ketones, which are oxidised to acids with same number of C-atoms.

Step-by-step Solution

Detailed explanation

Primary alcohols are easily oxidised to aldehydes and then to acid, both containing the same number of carbon atoms, while secondary alcohols are easily oxidised to ketones with same number of carbon atoms, but ketone oxidised to carboxylic acid containing lesser number of…

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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