What is the IUPAC name for the hydrocarbon ?
Answer and explanation
Correct answer: C. 4-Methylpent-2-yne
- Step 1: Identify the longest continuous carbon chain containing the principal functional group (the triple bond): a 5-carbon chain (pentyne).
- Step 2: Number the chain from the end that gives the lowest locant to the triple bond: numbering from right to left gives the triple bond at position 2 (vs position 3 from left).
- Step 3: At carbon 4, there is a methyl substituent: 4-methylpent-2-yne.
Answer
4-Methylpent-2-yne.
Why not the others: 2-Methylpent-3-yne violates the rule giving functional groups lowest locant priority over substituents; 4-Methylpent-3-yne numbers incorrectly; 2-Methylpent-2-yne places the methyl at the wrong carbon.
Practise more Hydrocarbons and reaction mechanisms.
Free questions with an explanation for every one, and full timed JEE Main mock tests.
More Hydrocarbons and reaction mechanisms questions
- What is the major product obtained when propene is treated with in the presence of benzoyl peroxide?
- Which of the following carbocations is the most thermodynamically stable due to maximum hyperconjugative and resonance stabilization?
- Ozonolysis of an alkene followed by reductive workup with yields equal equimolar amounts of propanone (acetone) and ethan…
- According to Hückel's aromaticity rule, which of the following species is non-aromatic or anti-aromatic rather than aromatic?
- When propyne is passed into warm dilute in the presence of at (Kucherov reaction), what…
- In the conformational analysis of n-butane about the C2-C3 single bond, which conformation possesses the lowest potential energy (highest th…