Question

Which of the following are Lewis acids?
(i) $BF _{3}$
(ii) $H _{2} O$
(iii) $HSO _{4}^{-}$
(iv) $SO _{3}$

• A. (i) and (iii)
• B. (i) and (ii)
• C. (i) and (iv)
• D. (iii) and (iv)

Answer 1

Answer: (C)

$BF _{3}$ and $SO _{3}$ are Lewis acids because they can accept electron pairs.