How many structural isomers have the molecular formula C₄H₉Br?
Correct answer B. 4
Explanation
The isomers are 1-bromobutane, 2-bromobutane, 1-bromo-2-methylpropane and 2-bromo-2-methylpropane. These four come from the two C₄ skeletons, each with two distinct positions.
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