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  3. Chemistry
  4. Which of the following is electron-deficient ?

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Q. Which of the following is electron-deficient ?

NEETNEET 2013Chemical Bonding and Molecular Structure

Solution:

Boron is an element of 13 group and contains three electrons in its valence shell. When its compound $ BH_3 $ dimerises, each boron atom carry only 6 electrons that is their octet is incomplete.
Hence, $ (BH_3)_2 $ is an electron deficient compound.
In all other given molecules octet of central atom is complete.