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| अम्ल | $pK_a$ |
| $(i)$ फिनोल | $a. 10$ |
| $(ii)$ $p-$नाइट्रोफिनोल | $b. 7.1$ |
| $(iii)$ एथिल अल्कोहल | $c. 16$ |
| $(iv)$ पिकरिक अम्ल | $d. 0.78$ |
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