Which is not a method of preparing carbon monoxide on a commercial scale ? (a) 473 1273 K (s) (g) (g) 2(g) C H O CO H - + ¾¾¾¾¾® + (b) 1273 K (s) 2(g) 2(g) (g) 2(g) 2C O 4N 2CO 4N + + ¾¾¾® + (c) (g) (s) 2(g) 2C O 2CO D + ¾¾® (d) 373 K conc.H SO HCOOH H O CO ¾¾¾¾¾¾ ® +

Commercially CO cannot be prepared by 2 4 373K 2 H SO HCOOH H O CO ¾¾¾® + 134 Carbon monoxide acts as a donor and reacts with certain metals to give metal carbonyls. This is due to (a) presence of one sigma and two pi bonds between C and (b) presence of a lone pair on carbon atom in CO molecule (c) presence of lone pair on oxygen atom in CO molecule (d) poisonous nature of CO. Due to presence of lone pair on carbon atom in CO, it acts as a donor in coordination chemistry.