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Arrange $X, Y$ and $Z$ in order of increasing acidic strengths.
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The correct answer is:
$X>Z>Y$
Carboxylic acid is stronger acid than $-\mathrm{NH}_3$, therefore, $X$ is the strongest acid. Since $-\mathrm{COOH}$ has $-I$-effect which decreases with distance, therefore, $-I$-effect is more pronounced on $Z$ than on $Y$. As a result, $Z$ is more acidic than $Y$. Thus, overall order of decreasing acidic strength is $X>Z>Y$.
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