Consider the following acids
(1) `CH_(3) COOH " "(2) Cl_(2) CHCOOH`
(3)` ClCH_(2)COOH" "(4) Cl_(3)C COOH`
The correct sequence of acidity is
A. `1 gt 4 gt 3 gt 2`
B. ` 1 gt 3 gt 2 gt 4`
C. ` 1 gt 2 gt 3 gt 4`
D. ` 4 gt 2 gt 3 gt 1`

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1 Answers

Correct Answer - D
Inductive effect diminishes with increases in the number of `sigma`- bonds through which the effect operates. This makes `ClCH_(2)COOH` more acidic than `ClCH_(2)CH_(2)COOH`. An electronegative atom Cl is an electron withdrawing group and acid strengthener.
Therefore, `ClCH_(2)COOH` is a stronger acid than `CH_(3)COOH` . Two chlorine atoms are more electron withdrawing than single Cl atom. So, `Cl_(2)CHCOOH` stronger acid than `ClCH_(2)COOH`.

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