The name of the alkyne which is given in the question with structure is propyne as in that 3 carbon atoms are present.
Alkynes are those hydrocarbons in which triple bond is present between two adjacent carbon atoms.
In the given structure one triple bond is present between first two carbon atoms and then with this a single bonded carbon atom is also attached. As in the structure total three carbon atoms are present so prefix shoul be 'prop' and as this is an alkyne then name should be propyne.
Hence name of compound is propyne.
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