Displayed formula for butene, which option is correct?

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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

Displayed formula for butene, which option is correct?

Explanation:
Displayed formula questions ask you to identify the size of the alkene by counting carbon atoms and spotting the double bond. Butene has four carbon atoms (C4H8), so its displayed formula will show four carbons in a chain with a carbon–carbon double bond somewhere in that chain. For example, CH2=CH-CH2-CH3 or CH3-CH=CH-CH3 both depict four carbons with a C=C bond. The option that shows four carbons with a double bond is the correct one. Ethene would show two carbons, propene three, and pentene five.

Displayed formula questions ask you to identify the size of the alkene by counting carbon atoms and spotting the double bond. Butene has four carbon atoms (C4H8), so its displayed formula will show four carbons in a chain with a carbon–carbon double bond somewhere in that chain. For example, CH2=CH-CH2-CH3 or CH3-CH=CH-CH3 both depict four carbons with a C=C bond. The option that shows four carbons with a double bond is the correct one. Ethene would show two carbons, propene three, and pentene five.

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