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In the above substance, the correct order of acidity of positions X, Y and Z is

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X > Y > Z

Z > X > Y

Y > X > Z

X > Z > Y

answer is B.

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Detailed Solution

Carboxylic acid is stronger acid than $- N H_{3}^{+}$ therefore, X is the strongest acid. Since -COOH has −I effect which decreases with distance, therefore, −I effect is more pronounced on Y than on Z. As a result, Y is more acidic than Z.

Thus, overall order of decreasing acidic strength is X > Y > Z.

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