Answer Happy

Answer all parts please
1. Hard organometallic reagents are important in many synthetic routes, both on in research labs and on an industrial scale. The nature of the metal has a significant effect on the reactivity observed a With reference to the ionicity and covalency of the bonding explain which of organo-lithium or organo-zinc reagents are considered harder and why [3 marks) b. How does the reactivity of organocadmium reagents compare to that of equivalent organozinc reagents? Use this fact to explain why organocadmium reagents are not widely used [2 marks] c. Diphenylzinc is dimeric in the solid side. Predict the degree of aggregation it will exhibit when dissolved in ) benzene and (@) THF. drawing the resultant structures. Explain your reasoning [4 marks] Salicylaldehyde reacts with diethyl zinc in a 1:1 ratio to form compound A according to the following scheme: OH • EtZ pas On cooling, compound B crystallises from solution, and half an equivalent of diethyl zinc is found to have reformed in solution B 0.5 En d. Identity A, B, and the gas [3 marks) e. By what process does A transform to B? Sketch a plausible intermediate. [2 marks] 1. A reacts cleanly with anhydrous HCl to release a gas and form compound C. Identify C, and explain why this is the sole product [2 marks! Question continues on next page g. A reacts cleanly with MesSic to form compound D, with molecular weight 194, a colourless crystalline solid, E, and reform some E1Zn. Identity D and E using the available data, and explain why this is the sole product 4 marks