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NEET levelSingle correct optionDifficulty 1 of 3cb002

In which of the following molecules does the central atom have an incomplete octet (only six electrons) in its Lewis structure?

  1. A\ce{H2O}
  2. B\ce{NH3}
  3. C\ce{BF3}
  4. D\ce{CCl4}

Answer: C

Boron has three valence electrons and forms three bonds in , so it has only electrons around it. N, C and O in the other molecules reach eight electrons.
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