Alkynes are hydrocarbons that contain one triple $C \equiv C$ bond.
Like alkenes, alkynes take part in addition reactions. A saturated compound can be formed.
For example, ethyne, $H-C \equiv C-H$, reacts with an excess of hydrogen to form ethane.
Propyne, ${C_3}{H_4}$, undergoes an addition reaction with an excess of hydrogen bromide in two stages.
What is the main product obtained when propyne reacts with an excess of hydrogen bromide?
Markovnikov’s rule applies to the addition of HBr at each stage.
1 )
$C{H_2}BrC{H_2}C{H_2}Br$
2 )
$C{H_3}C{H_2}CHB{r_2}$
3 )
$C{H_3}CHBrC{H_2}Br{\text{ }}$
$C{H_3}CB{r_2}C{H_3}$
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