Which of the following could be named as $2 -$ pentanone?

R - C O O H

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R - C H O

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R - C O - R

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R - C O O - R

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R - C O - N H_{2}

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Solution

The correct option is B $R - C O - R$
2-pentanone means ketone group at number2 carbon position and number of carbon is five.

Here compound in option C has a ketonic group. Thus option C is the correct answer.

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