Which of the following is the minor resonance contributor of a ketone? Which of

Question

Which of the following is the minor resonance contributor of a ketone? Which of the following correctly lists the formal charges on each atom of nitro methane (the tow oxy gens are denoted a and b)? Nitromethane has a relatively high boiling point of around 100degree C. Which of the following intermolecular forces is responsible for the high boiling point of liquid nitromethane? Hydrogen bonding Dipole - Dipole interactions van der Waals forces London dispersion forces none of the above contributes to the boiling point

Explanation / Answer

15. B (the resonance forms with less charge is more favored. B has separate charges and thus is minor resonance contributor).

16. A
formal charge of N = 5 (valence electrons) - 4 (number of bonds) - 0 (number of lone pair electrons) = +1
Oa = 6 - 2 - 4 = 0
Ob = 6 -1 - 6 = -1
H = 1-1 - 0 = 0
C = 4 - 4 - 0 = 0

17. B
due to the strong polarity of NO2 group, this molecule is very polar and thus has strong dipole-dipole interaction.

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