Dr. Sereda I was going through last years quiz and I was wondering what you were referring to when you asked to list the “alkylating agent”  in the reaction that produces 5-methyl-2-hexyne from propyne. I thought it might be something such as 1-bromo-3-methylpropane or 1-iodo-3-methylpropane, but I am not sure. (Alkylating group is a group introducing alkyl to another molecule. Both your examples fit this definition, because they introduce the iso-butyl group to the nucleophile generated from propyne. - GS).