Open-chain saturated alcohols of formula C5H12O that give a positive iodoform test (the unit CH3-CH(OH)- must be present) number

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Open-chain saturated alcohols of formula $C X_{5} H X_{12} O$ that give a positive iodoform test (the unit $CH X_{3} - CH (OH) X^{-}$ must be present) number

Answer: C

Check each secondary alcohol for the unit CH3-CH(OH)-: pentan-2-ol and 3-methylbutan-2-ol qualify; pentan-3-ol does not. Ethanol-type primary alcohols are absent among C5 isomers. Total 2.

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Open-chain saturated alcohols of formula CX5​HX12​O that give a positive iodoform test (the unit CHX3​−CH(OH)X− must be present) number

Answer: C

More questions on Counting structural isomers

Open-chain saturated alcohols of formula $C X_{5} H X_{12} O$ that give a positive iodoform test (the unit $CH X_{3} - CH (OH) X^{-}$ must be present) number