Question

The common name of 2-Butyne is:
A. acetylene
B. methyl acetylene
C. ethyl acetylene
D. dimethyl acetylene

Answer 1

Generally for any compound we have two types of names, one is common name and other one is IUPAC name. Common name is the name that we use in our regular life to define a chemical. IUPAC is a name that follows the chemistry rule for naming a compound.

Complete step by step solution:
-Butyne has a chemical formula ${{\text{C}}_{\text{4}}}{{\text{H}}_{\text{6}}}$. It has two isomers, 1-butyne and 2-butyne.
-Isomers are compounds with the same chemical formula but different arrangement of atoms.
-The two isomers of the butyne differ based on where the triple bond is located.

The common name of 2-butyne is dimethyl acetylene as it contains two methyl groups on either side of triple bonded carbons atoms.

Therefore, we can say that the common name of 2-butyne is dimethyl acetylene hence, option D is correct.

Additional Information:
-The 'yne' suffix refers to a triple bond. From the name but we can say that it has four carbon atoms and somewhere in the compound it also has a triple bond.
-At standard temperature and pressure 2-butyne is a colorless, volatile, pungent liquid.
-It's molar mass is 54 g/mol
-It is used in synthesis of alkylated hydroquinones.

Note: Another name for 2-butyne is crotonylene. It can be synthesized by the reaction of ethyl acetylene in a solution of ethanolic potassium hydroxide.