Question

when 2 moles of bromine gas reacts with propyne the IUPAC name of the product will be​

Answer 1

Answer:

Reaction of Alkynes with HBr (radical)

radical addition of HBr to alkynes

Reaction type: Radical Addition

Summary

When treated with 1 equivalent of HBr in the presence of oxygen or peroxides or uv light, an alkyne forms a vinyl bromide.

However, under these conditions which promote the radical addition, the regioselectivity is anti Markovnikov

addition of HBr to propyne under radical conditions

Peroxides (or uv light) facilitate the formation of a bromine radical e.g. RO.+ HBr -> ROH + Br .

Reaction proceeds via the more stable radical intermediate.

In the presence of excess HBr, a second addition can occur to the product alkene giving a vicinal or 1,2-dibromide (see above).

The major product from the reaction of excess HBr in the presence of peroxides to terminal alkynes are the 1,2-dibromoalkanes.

Note the difference in regiochemistry between this radical mechanism (see above) and the heterolytic pathway (see below).

addition of HBr to propyne

Hope it helps

Explanation: