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Which of the following is relatively weak acid $? ({pK}_{a}$ values are given in brackets)

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$HC$ (5.4)

HA (6.8)

$HB (4.2)$

$HD$ (9.62)

answer is D.

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Detailed Solution

When the compound is weak acid then the value of its ka will be low.

Since, $p K a \propto \frac{1}{K a}$

The compound having the highest amount of $p K a$ will be least acidic.

So, from the given options, HD has the highest $p K a$ value i.e., 9.62. Hence, it will be weak acid.

Therefore, the correct option is (D).

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