Bonding in metal carbonyls and applications

27 questions on Bonding in metal carbonyls and applications from the Coordination Compounds chapter: 5 NEET level, 11 JEE Main, 11 JEE Advanced. Each one opens with its answer and solution.

• Nickel tetracarbonyl, Ni(CO)4, has which geometry and hybridisation at nickel? NEET level
• Pentacarbonyliron(0), Fe(CO)5, has which shape? NEET level
• The 'synergic' bonding in a metal carbonyl M-CO consists of: NEET level
• The volatile compound used in the Mond process for refining nickel is: NEET level
• In a metal carbonyl, compared with free CO, the carbon-oxygen bond is: NEET level
• Which of the following mononuclear carbonyls does NOT obey the 18-electron rule? JEE Main level
• The structure of Mn2(CO)10 has: JEE Main level
• Which order of C-O stretching frequency is correct for the isoelectronic ions [V(CO)6]^-, Cr(CO)6 and [Mn(CO)6]^+? JEE Main level
• Assertion: The C-O stretching frequency of [Co(CO)4]^- is lower than that of Ni(CO)4. Reason: The negative charge on cobalt increases pi back-donation into the ... JEE Main level
• Which statements about bonding in metal carbonyls are correct? JEE Main level
• Match the carbonyl (List I) with its geometry and metal hybridisation (List II). List I: P Ni(CO)4; Q Fe(CO)5; R Cr(CO)6; S Mn2(CO)10. List II: 1 tetrahedral, s... JEE Main level
• Which of the following mononuclear species are paramagnetic? (Treat Co(CO)4 as the neutral monomer.) JEE Main level
• In the 18-electron structure of Fe2(CO)9 (three bridging CO, each counted as one electron to each Fe, plus one Fe-Fe bond), the total number of terminal CO grou... JEE Main level
• In the Mond process, impure nickel is purified because: JEE Main level
• In the 18-electron anion [Co(CO)4]^-, the oxidation state of cobalt and the valence-electron count (metal electrons plus two per CO, including charge) are: JEE Main level
• In the hydroformylation (oxo) process, propene reacts with CO and H2 in the presence of a cobalt carbonyl catalyst (active species HCo(CO)4). The main products ... JEE Main level
• Rh has 9 valence electrons. Using the 18-electron rule for each metal (count each CO as a 2-electron donor in total), find the number of Rh-Rh bonds in the tetr... JEE Advanced level
• Using the 18-electron rule per metal, the total number of metal-metal bonds in one molecule each of Mn2(CO)10, Fe2(CO)9, Co2(CO)8 and Fe3(CO)12 is: JEE Advanced level
• Which statements about Fe2(CO)9 are correct? JEE Advanced level
• Three isoelectronic hexacarbonyls [V(CO)6]^-, Cr(CO)6 and [Mn(CO)6]^+ show nu(CO) bands near 1860, 2000 and 2095 cm^-1 (in unknown order). Which assignment is c... JEE Advanced level
• Consider the tetrahedral carbonyls Ni(CO)4, [Co(CO)4]^- and [Fe(CO)4]^2-. Which statements are correct? JEE Advanced level
• A neutral, mononuclear, diamagnetic carbonyl M(CO)5 of a 3d metal obeys the 18-electron rule. Which metal M and shape fit? JEE Advanced level
• In the Mond process for nickel refining, which statements are correct? JEE Advanced level
• Compare [V(CO)6]^- with Cr(CO)6 (same size, 18 electrons each). Which statements are correct? JEE Advanced level
• In the solid state, which of the following carbonyls contain bridging CO groups? (Take Co2(CO)8 as the bridged solid-state form with two bridging CO.) JEE Advanced level
• Which row correctly gives the hybridisation and magnetic behaviour of Ni(CO)4, [Ni(CN)4]^2- (square planar) and [NiCl4]^2- in that order? JEE Advanced level
• Cobalt octacarbonyl reacts with hydrogen: Co2(CO)8 + H2 -> 2HCo(CO)4. Treating H as hydride (2-electron donor), the oxidation state of Co and its electron count... JEE Advanced level