(C) The general formula for alkynes is $C_nH_{2n-2}$.For the simplest alkyne,we set $n = 2$ because a triple bond requires at least two carbon atoms.S

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(C) The general formula for alkynes is $C_nH_{2n-2}$.For the simplest alkyne,we set $n = 2$ because a triple bond requires at least two carbon atoms.Substituting $n = 2$ into the formula: $C_2H_{2(2)-2} = C_2H_2$.This compound is known as ethyne or acetylene.