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Answer please! In the following compound, the favourable site/s for protonation is / are :

In the following compound, 

the favourable site/s for protonation is / are :

 

  • Option 1)

    (b), (c) and (d) 

  • Option 2)

    (a) and (e) 

  • Option 3)

    (a) 

  • Option 4)

    (a) and (d)

Answers (1)
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Basicity of Aromatic Amines -

The unshared pair of electrons at the nitrogen atom is in resonance with the benzene ring and hence not fully available for donation as in the case of aniline.

-

 

 

Basic Strength of Amines -

The basic strength of the amine is expressed as equilibrium constant Kb 

K_{b}=\frac{[RNH_{3}^{+}][OH^{-}]}{[RNH_{2}]}

- wherein

 

 

Nature of group and basicity -

Electron withdrawing groups ( -I and -M  effect ) decreases basicity, whereas Electron releasing groups ( +I and +M  effect ) increases basicity.

-

 

 

General order of basicity -

Aliphatic Amines > Ammonia > Aromatic Amines

-

(a) and (c) lp of Nitrogen are in resonance so the favourable sites for protonation are (b),(c) and (d).

 


Option 1)

(b), (c) and (d) 

Option 2)

(a) and (e) 

Option 3)

(a) 

Option 4)

(a) and (d)

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