C5H12 has the number of isomers ___________________?
Correct answer: C. three
- A. one
- B. two
- C. three
- D. four
Explanation
C5H12 has three structural isomers: n-pentane, 2-methylbutane and 2,2-dimethylpropane. The likely distractor is two, which results from counting only the straight-chain form and one branched form while missing the second branched arrangement.
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About Isomerism
Isomerism occurs when compounds have the same molecular formula but different atom arrangements or spatial orientations. The content includes chain, position, functional, metameric and tautomeric isomerism, along with geometrical and optical isomerism, including cis-trans forms, E/Z notation, chirality and enantiomers.
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