The functional group present in butanone is _________.

carboxylic acid

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aldehyde

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ketone

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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 $C H_{3} C H_{2} C H_{2} C H_{3}$ with a ketone group would be named in the following manner – Butane – ‘e’ = butan + ‘one’ = butanone.
Butanone $({CH}_{3} {CH}_{2} {COCH}_{3})$ is a four-carbon compound with the functional group ketone. It has a structure as shown below:

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Butanone is a four-carbon compound with the functional group

(a) carboxylic acid.

(b) aldehyde.

(d) alcohol.

-OH

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