Question

Which amongst the following is the IUPAC name of ${\mathrm{CH}}_3-C\equiv C-{\mathrm{CH}}_3$ ?

• A. 2-butyne
• B. 3-butyne
• C. 2-hexyne
• D. 3-propyne

Answer 1

The correct option is A 2-butyne

• It has four carbons in its parent chain. Hence, the root word should be but-.
• A triple bond is present between the second and the third carbon atom. Hence, the primary suffix will be -yne.
• The compound has no other substituent group or double bond in it. Hence, it will neither have a prefix nor a secondary suffix.
• The IUPAC name of the compound will be 2-butyne.