Minimum number of carbon atoms required in a ketone to show positional isomerism is:
A
3
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B
4
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C
5
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D
6
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Solution
The correct option is C 5 CH3−CH2CH2−O||C−CH3andCH3−CH2−O||C−CH2CH3⎫⎪
⎪
⎪
⎪⎬⎪
⎪
⎪
⎪⎭ are positional isomers. Any fewer number of carbons and the result is an aldehyde instead of a ketone.