Determine the number of lone pairs in the marked atoms of the following molecular structures.

• A. a. One pair of electrons
  b. One lone pair of electrons
  c. Two lone pairs of electrons
  d. Two lone pairs of electrons.
• B. a. No lone pair of electrons
  b. Two lone pairs of electrons
  c. Two lone pairs of electrons
  d. Three lone pairs of electrons.
• C. a. No lone pair of electrons
  b. One lone pair of electrons
  c. Two lone pairs of electrons
  d. Three lone pairs of electrons.
• D. a. No lone pair of electrons
  b. Three lone pairs of electrons
  c. One lone pair of electrons
  d. Three lone pairs of electrons.

Answer: (C)