Basic strength of alkyl amines in water (order or pKb)

1. A.
   ${Me}_{3}\text{ }N > {Me}_{2}NH > {MeNH}_{2} > {NH}_{3}$
2. B.
   ${Me}_{2}NH > {MeNH}_{2} > {Me}_{3}\text{ }N > {NH}_{3}$
3. C.
   ${Me}_{2}NH > {Me}_{3}\text{ }N > {MeNH}_{2} > {NH}_{3}$
4. D.
   ${NH}_{3} > {Me}_{3}\text{ }N > {MeNH}_{2} > {Me}_{2}NH$

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1. A.
   A-III, B-IV, C-II, D-I
2. B.
   A-III, B-II, C-I, D-IV
3. C.
   A-I, B-IV, C-II, D-III
4. D.
   A-III, B-II, C-IV, D-I

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1. A.
   ${NH}_{3} < H_{2}\text{ }N - {NH}_{2} < \left( {CH}_{3}{CH}_{2} \right)_{3}\text{ }N < {CH}_{3}{CH}_{2}{NH}_{2} <$ $\left( {CH}_{3}{CH}_{2} \right)_{2}NH$
2. B.
   ${NH}_{3} < H_{2}\text{ }N - {NH}_{2} < {CH}_{3}{CH}_{2}{NH}_{2} < \left( {CH}_{3}{CH}_{2} \right)_{2}NH <$ $\left( {CH}_{3}{CH}_{2} \right)_{3}\text{ }N$
3. C.
   $H_{2}\text{ }N - {NH}_{2} < {NH}_{3} < \left( {CH}_{3}{CH}_{2} \right)_{3}\text{ }N < {CH}_{3}{CH}_{2}{NH}_{2} <$ $\left( {CH}_{3}{CH}_{2} \right)_{2}NH$
4. D.
   ${NH}_{2} - {NH}_{2} < {NH}_{3} < {CH}_{3}{CH}_{2}{NH}_{2} < \left( {CH}_{3}{CH}_{2} \right)_{3}\text{ }N <$ $\left( {CH}_{3}{CH}_{2} \right)_{2}NH$

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