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  4. The correct order of acidity of following acids is CH 3 COOH , HCOOH , Cl - CH 2 COOH

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Q. The correct order of acidity of following acids is $CH _{3} COOH , HCOOH , Cl - CH _{2} COOH$Chemistry Question Image

Chhattisgarh PMTChhattisgarh PMT 2006

Solution:

Group or atom attached with $-COOH$ group shows positive inductive effect increases electron density on oxygen atom, which suppress the ionisation of $H^{+}$, hence, acidic strength decreases.
Group or atom attached with $-COOH$ group shows negative inductive effect decreases electron density on oxygen atom, which facilitate the ionisation of $H^{+}$, hence acidic strength increases.
Sequence of group shows negative inductive effect.
$- CHCl _{2}>- CH _{2} F >- CH _{2} Cl - CH _{3}$ group shows positive inductive effect and $-H$ doesn't show any effect.
So, $ > ClCH _{2} COOH > HCOOH > CH _{3} COOH$

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