alleryWhich atom acts as the electron-pair donor in a coordinate bond?
AThe atom with no electrons
BThe atom with the most protons
CThe atom with a lone pair
DAny metal atom
Answer & Solution
Correct answer: C. The atom with a lone pair
1. A coordinate bond needs one atom to donate a complete pair.
2. Only an atom that already has an unshared (lone) pair can donate.
3. The acceptor must offer an empty orbital.
4. In NH4+ the lone pair on nitrogen forms the coordinate bond with H+.
5. So the donor is the atom carrying the lone pair.
_Source: Selina Concise Chemistry ICSE Class 10, Ch 2 'Chemical Bonding'_
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