Practice Exam - Boron Halides; Radius Ratio Rule; Monomer vs. Dimer; Viscosity; Zeolites

3. Explain why: a. Lewis acid strengths of boron halides are in the order BBr3 >> BCl3 > BF3 opposite to the order expected based on electronegativities. b. Radius ratio rule is correct only 66% of the times in predicting coordination numbers in ionic compounds. c. Me3B is a monomer, whereas Me3Al exits as a dimer. d. Viscosity of liquid sulfur increases sharply at ~ 159oC e. Zeolites are used as shape selective reforming catalysts.

practice exam

This is a past exam for practice. Please complete question 5 only. 20 5. Write brief notes on any four of the following: a. Metal-organic vapor phase epitaxy b. Berry's rotation. c. Effect of polarization on melting points d. IR spectroscopy as a tool for structure determination of inorganic compounds e. Rochow process (Also included in attachment)

Ligands in organometallic chemistry

2. The following table lists infrared (IR) carbonyl stretching frequencies for three organometallic complexes. Explain why the infrared frequencies increase as one proceeds down the series. [V(CO)6] - 1860 cm-1 [Cr(CO)6] 2000 cm-1 [Mn(CO)6]+ 2090 cm-1

The 18- Electron Rule

Count the number of valence electrons associated with each metal in the list below. Determine if they obey the 18-electron rule. If they violate the 18-electron rule, comment on the stability/reactivity of the complexes. a) [V(CO)6] b) cis-[Rh(Br)(CO)2(PPh3)] c) [Fe2(CO)4(Cp)2] d) [Mn(CO)5(CH3)]

Organometallic chemistry

How many signals from the CO ligands do you expect to see in the 13C NMR spectrum of each of these complexes? Explain. a) [V(CO)6] b) cis-[Rh(Br)(CO)2(PPh3)] c) [Fe2(CO)4(Cp)2] d) [Mn(CO)5(CH3)]