Alkenes are more reactive than alkynes towards electrophillic addition reaction, yet vinyl acetylene reacts with 1 mol of `HBr` at triple bond. Explain why.

Explanation

To explain why vinyl acetylene reacts with 1 mole of HBr at the triple bond despite alkenes being generally more reactive than alkynes towards electrophilic addition reactions, we can analyze the reaction mechanism and the stability of the intermediates involved.

### Step-by-Step Solution:

1. **Identify the Structure of Vinyl Acetylene**:
- Vinyl acetylene is an alkyne with the structure:
\[
CH_2=CH-C≡CH
...