Q39 / 180 · COMEDK 2023 (Morning Shift) · Chemistry
Which of the following is incorrect?
- Correct answerASecondary alcohols are very easily oxidised to ketones, which are oxidised to acids with same number of C-atoms.
- BSecondary alcohols are easily oxidised to ketones, which are oxidised to acids with lesser number of $\mathrm{C}$-atoms.
- CPrimary alcohols are very easily oxidised to aldehydes, which are oxidised to acids with same number of C-atoms.
- DSecondary and tertiary alcohols on oxidation form acids with lesser number of C-atoms.
Solution
Primary alcohols are oxidized to aldehydes and then to carboxylic acids containing the same number of carbon atoms. This is a standard reaction sequence.
Secondary alcohols are oxidized to ketones. Further oxidation of ketones involves the cleavage of carbon-carbon bonds, which results in the formation of carboxylic acids with a lesser number of carbon atoms than the original alcohol.
Tertiary alcohols are resistant to oxidation under normal conditions, but under vigorous conditions, they undergo carbon-carbon bond cleavage to form a mixture of acids with a lesser number of carbon atoms.
The statement in option YLWBR claims that secondary alcohols are oxidized to ketones, which are then oxidized to acids with the same number of carbon atoms. This is incorrect because the oxidation of ketones necessarily involves the breaking of C-C bonds, leading to products with fewer carbon atoms.
Answer: Secondary alcohols are very easily oxidised to ketones, which are oxidised to acids with same number of C-atoms.
Secondary alcohols are oxidized to ketones. Further oxidation of ketones involves the cleavage of carbon-carbon bonds, which results in the formation of carboxylic acids with a lesser number of carbon atoms than the original alcohol.
Tertiary alcohols are resistant to oxidation under normal conditions, but under vigorous conditions, they undergo carbon-carbon bond cleavage to form a mixture of acids with a lesser number of carbon atoms.
The statement in option YLWBR claims that secondary alcohols are oxidized to ketones, which are then oxidized to acids with the same number of carbon atoms. This is incorrect because the oxidation of ketones necessarily involves the breaking of C-C bonds, leading to products with fewer carbon atoms.
Answer: Secondary alcohols are very easily oxidised to ketones, which are oxidised to acids with same number of C-atoms.
Hence, the correct answer is option: 'A'.