Question

A molecule of ${\mathrm{NH}}_3{\mathrm{BF}}_3$has a dative bond. The donor atom in the bond is and acceptor atom is .

• A. nitrogen
• B. hydrogen
• C. boron
• D. fluorine

Answer 1

Answer: (A), (C)

The correct options are
A nitrogen
C boron

N in ${\mathrm{NH}}_3$ has a lone pair of electron. Boron (B) is electron deficient in ${\mathrm{BF}}_3$ as it has only six electrons in its valence shell. A dative bond is formed between these molecules, where N donates its lone pair to Boron (B). Thus, nitrogen acts as donor and boron acts as acceptor.