Which of the following is a pair of functional isomers ?

C H_{3} C O C H_{3}, C H_{3} C H O

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C_{2} H_{5} C O_{2} H, C H_{3} C O_{2} C H_{3}

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C_{2} H_{5} C O_{2} H, C H_{3} C O_{2} C_{2} H_{5}

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C H_{3} C O_{2} H, C H_{3} C H O

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Solution

The correct option is B $C_{2} H_{5} C O_{2} H, C H_{3} C O_{2} C H_{3}$
Functional isomers are compound. with same molecular formula but different functional groups.
A) Not isomers. (Molecular formula is different)

B) $C_{2} H_{5} C O O H$ and $C H_{3} C O O C H_{3}$ functional isomers.

(Acid) (ester)
C) Not isomers. (Molecular formula is different)
D) Not isomers.(Molecular formula is different)

Option B is correct.

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K M n O_{4}

The compound $C H_{3} | C H_{3} - C = C H - C H_{3}$ on reaction with $N a I O_{4}$ in the presence of $K M n O_{4}$ gives

C H_{3} C H O

C H_{3} C H_{2} C O O H

C H_{3} C O C H_{3}

C H_{3} C H_{2} C H_{2} O H

C H_{3} O H, C H_{3} C O O H, C H_{3} C H O, C H_{3} C O C H_{3}

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