Heptane is insoluble in water. Explain why water is incapable of dissolving heptane

Question

A. Heptane is a molecular compound rather than an ionic compound.

B. Heptane is a nonpolar molecule composed of a long hydrocarbon chain.

C. Heptane's long carbon chain gives it a greater dipole moment than water.

D. Entropy tends to keep heptane molecules clustered together.

Answer 1

Water (H2O) is a polar molecule. For a substance to dissolve in water, it also needs to have the same polarity, "like dissolves like". Heptane does not dissolve in water because it is nonpolar due to the long hydrocarbon chain. 

 

Answer is B

Answer 2

B. Heptane is a nonpolar molecule composed of a long hydrocarbon chain.