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Question

The functional group present in butanone is _________.


A

carboxylic acid

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B

aldehyde

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C

ketone

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D

alcohol

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Solution

The correct option is C

ketone


When the name of the functional group is to be given as a suffix, and the suffix of the functional group begins with a vowel a, e, i, o, u, then the name of the carbon chain is modified by deleting the final ‘e’ and adding the appropriate suffix.
For example, a four-carbon chain CH3CH2CH2CH3 with a ketone group would be named in the following manner – Butane – ‘e’ = butan + ‘one’ = butanone.
Butanone (CH3CH2COCH3) is a four-carbon compound with the functional group ketone. It has a structure as shown below:


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