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Question
Which among the following carboxylic acids is strongest acid?
Options
\[\ce{Cl - CH2 - COOH}\]
\[\ce{Br - CH2 - COOH}\]
\[\ce{F - CH2 - COOH}\]
\[\ce{Cl3 - C - COOH}\]
MCQ
Solution
\[\ce{Cl3 - C - COOH}\]
Explanation:
The strength of the acid increases with the negative inductive effect of the electronegative group attached to it. (i.e, - I-effect). Among the given options, \[\ce{Cl3 - C - COOH}\] has three electronegative groups, which results in the highest - I-effect. Hence, it is the strongest acid.
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Classification of Aldehydes, Ketones and Carboxylic Acids
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