Question

According to the Lewis acid-base concept:

• A. species in which the central atom has completed octet can not act as an acid.
• B. negatively charged ions are acids.
• C. molecule in which a central atom has vacant d-orbitals available acts as an acid.
• D. all positively charged ions are bases.

Answer 1

Answer: (C)

molecule in which a central atom has vacant d-orbitals available acts as an acid.

According to the Lewis acid-base concept:

Lewis Acid: a species that accepts an electron pair (i.e., an electrophile) and will have vacant orbitals

Lewis Base: a species that donates an electron pair (i.e., a nucleophile) and will have lone-pair electrons

Hence option C is correct.