Open-chain alcohols of formula $C X_{5} H X_{12} O$ are treated with acidified potassium dichromate. How many of the isomers can be oxidised (to an aldehyde/acid or ketone) without breaking carbon-carbon bonds? (Structural isomers only.)

Answer: A

Oxidation without C-C cleavage requires at least one H on the carbinol carbon: primary (4) and secondary (3) alcohols qualify; the tertiary alcohol 2-methylbutan-2-ol (1) does not. Total 4 + 3 = 7.

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Open-chain alcohols of formula CX5​HX12​O are treated with acidified potassium dichromate. How many of the isomers can be oxidised (to an aldehyde/acid or ketone) without breaking carbon-carbon bonds? (Structural isomers only.)

Answer: A

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Open-chain alcohols of formula $C X_{5} H X_{12} O$ are treated with acidified potassium dichromate. How many of the isomers can be oxidised (to an aldehyde/acid or ketone) without breaking carbon-carbon bonds? (Structural isomers only.)