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MHT CET202521 Apr 2025Morning ShiftChemistryChemical Bonding and Molecular StructureActual

Which of the following is Lewis base?

Options

  1. ABF ₃
  2. BCu ²⁺
  3. CAlCl ₃
  4. DNH ₃

Correct answer

D. NH ₃

Step-by-step solution

Lewis bases are defined as electron-pair donors. To identify which species fulfills this role, examine the electronic structure of each compound. For BF ₃ , boron has only six valence electrons and is electron-deficient, allowing it to accept electrons as a Lewis acid . The Cu ²⁺ ion, being a cation, acts as an electron acceptor and is also a Lewis acid . In AlCl ₃ , aluminum has an incomplete octet with six electrons, functioning as a Lewis acid . Ammonia ( NH ₃ ) possesses a lone pair on nitrogen, which it can do

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