What is the structural difference between but-1-ene and but-2-ene?

Q: How do I try a free CXC Chemistry question?

Just tap any of the four options on this page — no signup, no card, nothing to install. You'll see the correct answer and a full mark-scheme-style explanation within a second. Each visit shows a fresh randomly-picked question from the live CXC CSEC Chemistry bank, so you can keep refreshing to try different ones before deciding whether to create a free account for daily access.

Q: Is Kramizo really free for CXC Chemistry students?

Yes — completely free. Every student gets 45 questions a day on the free plan, across any board and any subject, with no card required and no trial countdown. Kramizo's optional Pro plan removes the daily cap and adds analytics, but the free plan is genuinely free forever. We make money from the small percentage of students who choose to upgrade — not from selling data or ads.

Q: Are the Chemistry questions aligned to the CXC CSEC syllabus?

Every question is written against the published CXC CSEC Chemistry syllabus and reviewed for accuracy before being added to the bank. We match the command words (state, describe, explain, evaluate), mark allocations, and difficulty tier you'll see on real CXC past papers. Explanations are written in the style of official examiner mark schemes so students learn exactly what marks are being awarded for.

Question

What is the structural difference between but-1-ene and but-2-ene?

Accepted Answer

The position of the double bond along the carbon chain differs — But-1-ene and but-2-ene are positional isomers — they share the same molecular formula (C₄H₈) but differ in the position of the C=C double bond. In but-1-ene the double bond is between C1 and C2; in but-2-ene it is between C2 and C3. They are not structural isomers with different carbon counts.

Answer

But-1-ene has more carbon atoms than but-2-ene

Answer

They have different molecular formulae

Answer

The position of the double bond along the carbon chain differs

Answer

But-2-ene contains a triple bond instead of a double bond

One real Chemistry question.No signup. 30 seconds.

One real Chemistry question.
No signup. 30 seconds.