First slide

Alkynes

Question

There are two paths to prepare compound (A) (2-methylhex-1-en-3-yne). which of the following statements is correct?

Difficult

A

Path I is feasible.
B

Path II is feasible.
C

Both paths are feasible.
D

Both paths are not feasible.

Solution

In path I, SN² reaction is not possible because RX is unreactive vinyl bromide. In Path II, nucleophilic addition reaction is favoured-anion
is a strong nucleophile-to give the product which on dehydration gives compound A.

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