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  • Please help! Among the following four compounds(i) Phenol (ii) Methylphenol(iii) Meta-nitrophenol (iv) Para-nitrophenolthe acidity order is:

Among the following four compounds

(i) Phenol                                      (ii) Methylphenol

(iii) Meta-nitrophenol                   (iv) Para-nitrophenol

the acidity order is:

  • Option 1)

    ii>i>iii>iv

  • Option 2)

    iv>iii>i>ii

  • Option 3)

    iii>iv>i>ii

  • Option 4)

    i>iv>iii>ii

 

Answers (1)

As we learnt in 

Order of acidity of alcohols -

H_{2}O>1^{\circ }>2^{\circ }>3^{\circ }>RC\equiv CH>>>RCH_{3}

-

 

 

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.

 

 Para form is more acidic than meta form

 


Option 1)

ii>i>iii>iv

Incorrect

Option 2)

iv>iii>i>ii

Correct

Option 3)

iii>iv>i>ii

Incorrect

Option 4)

i>iv>iii>ii

Incorrect

Posted by

Vakul

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