Multiple Choice
Which of the following pairs of compounds are constitutional isomers?
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1. A Review of General Chemistry
Constitutional Isomers
Multiple Choice
Which pair of the following molecules are constitutional isomers? (A) n-butane and isobutane (B) and (C) and (D) and
A
(B) and
B
(D) and
C
(C) and
D
(A) n-butane and isobutane
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Verified step by step guidance1
Recall that constitutional isomers are molecules that have the same molecular formula but different connectivity of atoms.
Examine each pair of molecules and compare their molecular formulas to see if they match exactly.
For pair (A), both n-butane and isobutane have the molecular formula \(C\\_4H\\_{10}\), so they are candidates for constitutional isomers.
For pairs (B), (C), and (D), note that the molecular formulas differ between the two molecules in each pair, so they cannot be constitutional isomers.
Conclude that the pair with identical molecular formulas but different structures (connectivity) is the correct answer, which is pair (A).
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