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Q.

Statement I : Basic strength of CH32NH > CH3NH2 > CH33NStatement II : Basic strength of C2H52NH > C2H53N > C2H5NH2

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a

Both statements I and II are correct

b

Statement - I is correct and statement - II is incorrect

c

Statement - I is incorrect and statement - II is correct

d

Both statements I and II are incorrect

answer is A.

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Detailed Solution

Basic strength in amines is decided by the cumulative effect of H–bonding, +I effect and steric hindranceIn general, Basic strength of 20amine > 30amine > 10amineEx :(C2H5)2NH > C2H53N  > C2H5NH2 Based on +I effect only (in gas phase) … 30 > 20 > 10Based on steric hindrance & H–bonding ….10 > 20 > 30In methyl amines there is no steric hindrance to H bonding. Hydrogen bonding dominates + I effect  ∴ CH32NH > CH3NH2 > CH33N
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