All the following are a pair of functional isomers except

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Propan-1-ol and methoxy ethane

Acetic acid and methyl formate

Acetaldehyde and acetone

Butanal and but-3- en-1-ol

answer is B.

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Detailed Solution

$C H_{3} - \overset{O}{\overset{| |}{C}} - H,$ $C H_{3} - \overset{O}{\overset{| |}{C}} - C H_{3}$ not isomers as chemical formula is different.

$C H_{3} - C H_{2} - C H_{2} - \overset{O}{\overset{| |}{C}} - H$ and $C H - C H_{2} - C H_{2} - C H = C H_{2}$ are functional isomers.

$C H_{3} - C H_{2} - C H_{2} - O H$ & $C H_{3} - O - C H_{2} - C H_{3}$ are functional isomers.

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