Which of the following compounds contains an amine group?

C H_{3} - C H_{2} - C H_{3}

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C H_{3} C O O H

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C H_{3} - O - C_{3} H_{7}

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C H_{3} - C H_{2} - N H_{2}

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Solution

The correct option is D $C H_{3} - C H_{2} - N H_{2}$
Amines are compounds which have nitrogen atom with free lone pair on it, attached with hydrocarbon. It can be derived by replacing one or more $H$ atom(s) of an ammonia with alkyl group(s).
Compound (a) is a saturated hydrocarbon.
Compound (b) is carboxylic acid.
Compound (c) is ether.
Compound (d) is amine.
The structure given is of ethylamine. It is derivative of ammonia in which one H atom attached to nitrogen is replaced by one ethyl group.

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