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Amines as Bases

Correct grada...

Question

Correct gradation of basic character is:

A

N H_{3} > C H_{3} N H_{2} > N F_{3}

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B

C H_{3} N H_{2} > N H_{3} > N F_{3}

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C

N F_{3} > C H_{3} N H_{2} > N H_{3}

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D

C H_{3} N H_{2} > N F_{3} > N H_{3}

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Solution

The correct option is C $C H_{3} N H_{2} > N H_{3} > N F_{3}$
Correct gradation of basic character is $C H_{3} N H_{2} > N H_{3} > N F_{3}$ . Due to $+ I$ effect of methyl group, the electron density on $N$ increases.

Hence, $C H_{3} - N H_{2}$ is most basic as it can easily donate lone pair of electrons on N.

Due to $- I$ effect of F atom, the electron density on $N$ decreases. Hence, $N F_{3}$ is most basic as it can easily donate lone pair of electrons on N.

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