Which one of the following acids would you expect to be the strongest?
A
I−CH2COOH
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B
Cl−CH2COOH
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C
Br−CH2COOH
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D
F−CH2COOH
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Solution
The correct option is DF−CH2COOH The structure which has strongest withdrawing group is the strongest acid. Among halogens, Flourine is strong withdrawing group because it is the most electronegative atom. So, F−CH2−COOH is the strongest acid.