Question

choose the most perfect reagent​

Answer 1

Answer:

The best reagents to carry out the given transformation are I. Acetylene, NaNH2/NH3, II. H2 /Pd/BaSO4  and III. OsO4 /NaHSo3​  

 

The acidic H atoms of acetylene are abstracted with soda amide to form a dianion. This dianion then attacks two moles of n propyl bromide to form two C-C single bonds with loss of two bromide ions.  

In the next step, carbon carbon triple bond is reduced to cis C=C double bond by hydrogenation with Pd in presence of barium sulphate. In the last step, C=C double bond is converted to a vicinal diol.