Q2. (a) describe the differences in chemical bonding that can be used to distinguish a semi-bridging h2-co ligand from a symmetrical 12-co ligand? (5 marks) (b) explain why the v- o stretching frequency changes when bis(acetylacetonato)oxovanadium(iv) is dissolved in pyridine. (4 marks) (c) the interaction of na fe(co), with (ch3)2nch i gives the carbene complex (co) fechn(ch3)2. write a plausible reaction sequence. (8 marks)