Respuesta :
Compound A is neopentane while compound B is n - pentane.
First of all, we must note that the compounds A and B are alkanes and isomers of pentane. Isomers are compounds that have the same molecular formula but different structural formulas.
Now, compound A gives a single monochlorination product when heated with Cl2 showing that the molecule is highly symmetric. This molecule must be neopentane (image 1).
Compound B forms  three constitutional isomers upon monochlorination. This compound must be n-pentane since three are three different types of carbon atoms in the structure(image 2).
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