The number of structural isomers of C4H10 is
- A. one
- B. two
- C. three
- D. four
Explanation
Butane has an unbranched chain of four carbons and 2-methylpropane has a three carbon chain with a methyl branch, and no other arrangement is possible, so there are two. Pentane, C5H12, has three isomers, which is why three is offered here as a distractor. The number of isomers rises very steeply as the chain lengthens.
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