| 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 |
Convert Ethanal to But-2-enal
Write structure of the products of the following reactions: 