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JEE Main levelSingle correct optionDifficulty 2 of 3g2031

Match the acid in List I with its approximate pKa in List II. List I: (P) picric acid, (Q) acetic acid, (R) phenol, (S) ethyne. List II: (1) 25, (2) 0.4, (3) 10.0, (4) 4.76.

  1. AP-2, Q-4, R-1, S-3
  2. BP-2, Q-4, R-3, S-1
  3. CP-2, Q-3, R-4, S-1
  4. DP-4, Q-2, R-3, S-1

Answer: B

Picric acid is the strongest of these (pKa 0.4), then acetic acid (4.76), phenol (10.0) and ethyne (25). So P-2, Q-4, R-3, S-1.
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