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pKa is more for

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As learnt in

Effects of substituents on acidity of phenols -

1.  Electron withdrawing group like   -NO_{2},-CN,-X,-CHO

2.  Electron donating group like    -R,-OR,-NH_{2}

- wherein

1.  Increase the acidic strength of phenol.

2.  Decrease the acidic strength of phenol.

 

 

Reaction with Nitrous Acid Primary Amines -

Primary amines react with nitrous acid to produce diazonium ion.

- wherein

R-NH_{2}+HNO_{2}\rightarrow R-N^{\oplus }\equiv N

 

ArNH_{2}+HNO_{2}\rightarrow Ar-N^{\oplus }\equiv N:

 

 Acidity increases down the group. Higher is the pka value, weaker is the acid.

 

 


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