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Q.

Correct order of basic strength is given by
I) Methanamine
II) N-methyl ethanamine
III) N,N-dimethyl methanamine

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a

III > I > II

b

II > I > III

c

II > III > I

d

III > II > I

answer is C.

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Detailed Solution

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  • When hydrogen atoms of the amino group of amines are replaced by electron donating alkyl groups, the basic character of the resulting amine increases.
  • But, 3o amine is less basic due to steric hindrance.
  • Thus, the order of basicity is: N-methyl ethanamine(2oamine)>Methanamine(1oamine)>  N,N-dimethyl methanamine(3oamine).
  • This is due to +I effect and Solvation effect.
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