Water, 
O, and methane, C 
, have about the same mass and differ by only one type of atom. Why is the boiling point of water so much higher than that of methane?
A) The water molecule is less symmetrical than is the methane molecule.
B) The oxygen of a water molecule has two lone pairs of electrons.
C) The electronegativity difference between oxygen and hydrogen is greater than the electronegativity difference between carbon and hydrogen.
D) all of the above
Correct Answer:
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