Statement 1 : Aliphatic amines are weaker bases than ammonia and aromatic amines are stronger bases than ammonia.
Statement 2 : +I-effect of alkyl groups on aliphatic amines increase the electron density on nitrogen atom. Aromatic amines are weaker due to electron withdrawing nature of the aryl group.

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Statement 1 is incorrect and statement 2 is correct

Both statements 1 and 2 are correct

Both statements 1 and 2 are incorrect

Statement 1 is correct and statement 2 is incorrect

answer is D.

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Detailed Solution

Aliphatic amines are stronger base than ammonia due to +/-effect of alkyl groups leading to high electron density on the nitrogen atom.Their pK_b values lie in the range of 3 to 4.22- Which is lower than pK_bvalue of NH₃, i.e. 4.75. On the other hand, aromatic amines are weaker base than ammonia due to the electron withdrawing nature of the aryl group.

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