| List I | List II | ||
| A. | Rosenmund reduction | I. | CrO2Cl2CS2,H3O+ |
| B. | Etard Reaction | II. | CO, HCl Anhyd. AlCl3/CuCl |
| C. | Gamenman-Koch reaction | III. | H2-Pd-BaSO4 |
| D. | Clemmensen reduction | IV. | Zn-Hg/HCl |
Match the amino acid given in List-I with their one-letter code given in List-II
\[ \begin{array}{|l|l|} \hline \textbf{Name of amino acid} & \textbf{One-letter code} \\ \hline (A) \; \text{Lysine} & (I) \; W \\ \hline (B) \; \text{Tryptophan} & (II) \; Q \\ \hline (C) \; \text{Tyrosine} & (III) \; K \\ \hline (D) \; \text{Glutamine} & (IV) \; Y \\ \hline \end{array} \]
The increasing order of acidity of the following compounds based on pKa values:
(A) BrCH$_2$COOH
(B) ClCH$_2$COOH
(C) FCH$_2$COOH
(D) HCOOH
What comes next in the series?
\(2, 6, 12, 20, 30, \ ?\)