please explain questions 12, 13, 17,18,19. Give an explanations i know the answe

Question

please explain questions 12, 13, 17,18,19. Give an explanations i know the answers but im not clear why these answers are right.

Of the following, which best explains the fact that at 298 K, heptane, C7H16, is a liquid, but methane, CH4, is a gas? a) Stronger London bonding between heptane molecules than between methane molecules b) Weaker C-C and C-H bonds in heptane molecules than is methane molecules c) Stronger C-C an C-H bonds in heptane molecules than in methane molecules d) Weaker London bonding between heptane molecules than between methane molecules e) Stronger dipole-dipole bonding between heptane molecules than between methane molecules

Explanation / Answer

19 e and 20 b

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