Acetylene is allowed to react with an excess of HCl in the presence of `HgCl_2`. The product formed is

Acetylene is allowed to react with liquid bromine

Trityl chloride (Ph_(3)C Cl) is allowed to react with ethyl alcohol in the presence of pyridine.The product formed is

When acetylene is treated with very dil. HCl in the presence of HgCl_2 , the product obtained is

On heating aniline with CS_2 in the presence of HgCl_2 the product is:

When ethene is allowed to react with diazomethane is presence of UV is light, the product formed is

Acetone when allowed to react with excess benzaldehyde in presence of NaOH gives

1,3 -Dibromopropane is allowed to react with magnesium ( in excess) in dry ether. The product formed is

When benzene reacts with excess of chlorine in the presence of anhy. AlCl_3 , the product(s) formed