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Arrange in order of increasing acidic strength A. `X gt Z gt Y`B. `Z gt X gt Y`C. `X gt Y gt Z`D. `Z gt X gt Y`

Answer» Correct Answer - A
`pK_(a)` value of carboxylic group is less than `pK_(a)` of `overset(+)(N)H_(3)` in amino acid and `-overset(+)(N)H_(3)` (Z) will have comparatively less `pK_(a)` than `-overset(+)(N)H_(3)` (Y) due to -I effect of carboxylic group. We know that acidic strength is inversely proportional to `pK_(a)`. Hence, correct order of acidic strength is `-CO_(2)H_((X)) gt -overset(+)(N)H_(3(Z)) gt - overset(+)(N)H_(3(Y))`


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