(Solved): A student proposes to synthesize an alkyne A1 from a smaller alkyne A2 and an alkyl bromide B ...

A student proposes to synthesize an alkyne $A_1$ from a smaller alkyne $A_2$ and an alkyl bromide $B$ in two steps, like so: Is the student's proposal reasonable? Can $A_1$ be made in good yield from a smaller alkyne $A_2$, without losing too much starting material to competing reactions that produce unwanted byproducts? yes no If you said the student's proposal was reasonable, draw both ${\mathrm{A}}_2$ and $\mathrm{B}$ in the drawing area below. If there's more than one reasonable pair of starting reactants, draw any one pair.