Chemistry - STRUCTURAL ISOMERISM Question with Solution | TestHub
How many distinct terminal alkynes exist with a molecular formula of ?
Options:
Answer:
Solution:
Question Explanation:
The question asks for the number of different terminal alkynes that can be formed with the molecular formula .
Concept: This is based on structural isomerism.
Solution: For a terminal alkyne, one end of the molecule must be a group. The remaining three carbon atoms can be arranged in different ways to form isomers.
1. Straight Chain: The three remaining carbons form a straight chain attached to the triple bond.
CH3 −CH2 −CH2 −C≡CH (IUPAC name: Pent-1-yne)
2. Branched Chain: The three remaining carbons form a branched chain attached to the triple bond.
CH3 −CH(CH3 )−C≡CH (IUPAC name: 3-Methylbut-1-yne)
These are the only two possible distinct structures for a terminal alkyne with the formula C5H8 .
Final Answer: Option (B)