IGCSE Edexcel Chemistry Practice Test

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Which name corresponds to the straight-chain alkane with five carbons?

Pentane

Identify the straight-chain alkane by counting the carbons in a continuous chain. Five carbons in a single unbranched chain are named pentane. The other options are not straight-chain five-carbon alkanes: isopentane is a branched form (2-methylbutane), neopentane is even more branched (2,2-dimethylpropane), and cyclopentane is a ring of five carbons, not a chain. So pentane is the correct name for the straight-chain five-carbon alkane.

Isopentane

Neopentane

Cyclopentane

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