In the correct IUPAC name of the compound , what is the locant number assigned to the triple bond? — IUPAC and Nomenclature Chemistry Question

💡 Solution & Explanation

The principal carbon chain has 7 carbons (heptane). Numbering from left to right gives the triple bond locant 3. Numbering from right to left gives locant 4. The lowest locant (3) is selected. The name is 5-Methylhept-3-yne. The locant is 3.