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Question

Which of the following will be more acidic?


A

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B

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C

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D

All will be same

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Solution

The correct option is C


Let's talk about what do you mean by acidic strength.

Acid strength is measured by the position of equilibrium of ionization in water.

The further the ionization goes to the right, the greater the acid strength.

In other words.

Acid strength α Ka α 1pKa
or Acid strenghth α concentration of acid anion
or Acid strength of acid is the function of stability of acid anion.
The influence of the inductive effect on acidity can be summarized as follows:

Electron withdrawing group (-| gp) stabilizes acid anion and strengthens the acid or

,-| group increases strength of acid and thus:

strength of acid α-| power of the group present on -COOH

(b)

Electron donating groups (i.e.,+|gp) destabilise acid anion and weaken the acid. or, +| group
decreases strength of acid and thus:

Strength of acid α 1+IpowerofthegrouppresentonCOOH α -| power of group

Therefore,


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