Question

Propyne on passing through red hot iron tube gives

Answer 1

Answer: Propyne on passing through red hot iron tube gives 1,3,5-trimethyl-benzene.

Explanation:

Propyne on passing through red hot iron tube at 873 kelvins results in cyclic polymerization of propyne. Mesitylene or 1,3,5-trimethyl-benzene is obtained as a final product.

Three molecules of propyne are fused together in such a way that it gives an aromatic ring of six carbon atom with three methyl groups on alternate carbon atoms.

As shown in image attached.

Answer 2

Answer: we obtain 1,3,5-trimethyl benzene, aka mesitylene

Hope this helps