JEE Main · 2005 · 08 May 2005 · Offline · Redox Reactions and Electrochemistry

The highest electrical conductivity of the following aqueous solutions is of

(A)0.1 M acetic acid
(B)0.1 M chloroacetic acid
(C)0.1 M fluoroacetic acid
(D)0.1 M difluoroacetic acid✓ Correct

Answer: (D)

Solution

Conductivity of these acid solutions tracks how fully each one ionises, which in turn tracks acid strength. Electron-withdrawing fluorine atoms pull electron density away from the carboxylate, stabilising the conjugate base and driving the dissociation further. With two fluorines, difluoroacetic acid is the strongest of the set and ionises most completely, so its solution carries the most ions and shows the highest conductivity.

JEE Main · 2005 · 08 May 2005 · Offline · Single correct option

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