Discuss the solvent compatibility for LiAlH_4 and NaBH_4 reagents and the factors responsible for differential reactivity. Also suggest preferred reagent between the two for the above transformations.

2Medium10 marks

In the reaction

R - COO^- + Br^- CN \rightarrow R - CN + Br^- + CO_2 ^\uparrow

What is the origin of - CN group in the product ? Explain by using isotopic labelling technique.

3Medium10 marks

Complete the following reactions :

(i) XeF4 + 12H2O →

(ii) XeF6 + → XeOF4 + PF5

(iii) XeOF4 + → 2XeO2F2

(iv) 3XeF2 + 2(SO3)3 →

(v) → + XeF2 → (C6H5)2SF2 + Xe

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