What is the molecular formula for pentene?

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Study for the IGCSE Organic Chemistry Test. Engage with flashcards and multiple-choice questions, complete with hints and detailed explanations. Prepare effectively to excel in your exam!

Multiple Choice

What is the molecular formula for pentene?

Explanation:
Pentene is an alkene with five carbon atoms and one carbon–carbon double bond. For acyclic alkenes, the formula is CnH2n, so with n = 5 the molecular formula is C5H10. This is two hydrogens fewer than the corresponding alkane with five carbons (pentane, C5H12) due to the double bond. The other options don’t match five carbons, so they aren’t pentene. Therefore, the molecular formula is C5H10.

Pentene is an alkene with five carbon atoms and one carbon–carbon double bond. For acyclic alkenes, the formula is CnH2n, so with n = 5 the molecular formula is C5H10. This is two hydrogens fewer than the corresponding alkane with five carbons (pentane, C5H12) due to the double bond. The other options don’t match five carbons, so they aren’t pentene. Therefore, the molecular formula is C5H10.

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