How many acyclic carbonyl compounds (aldehydes and ketones, ignoring stereoisomers) of molecular formula $C X_{5} H X_{10} O$ give a positive iodoform test?

Answer: B

The isomers are 4 aldehydes and 3 ketones. Only methyl ketones respond, because no aldehyde other than ethanal does: pentan-2-one and 3-methylbutan-2-one. The answer is 2.

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How many acyclic carbonyl compounds (aldehydes and ketones, ignoring stereoisomers) of molecular formula CX5​HX10​O give a positive iodoform test?

Answer: B

More questions on Haloform reaction

How many acyclic carbonyl compounds (aldehydes and ketones, ignoring stereoisomers) of molecular formula $C X_{5} H X_{10} O$ give a positive iodoform test?