To determine which of the given molecules contains a coordinate covalent bond, let’s analyze each option:
A. Sodium chloride (NaCl):
- This compound is formed by an ionic bond between sodium (Na) and chlorine (Cl).
B. Ammonia (NH₃):
- In ammonia, nitrogen (N) forms three covalent bonds with hydrogen (H) atoms. These are polar covalent bonds, but none are coordinate covalent bonds.
C. Chlorine (Cl₂):
- Chlorine forms a non-polar covalent bond between two chlorine atoms.
D. Aluminium bromide (AlBr₃):
- Aluminium bromide is an ionic compound composed of aluminium (Al) and bromine (Br).
E. Carbon monoxide (CO):
- Carbon monoxide has a unique bonding structure that includes a coordinate covalent bond. In CO, there is a triple bond consisting of two covalent bonds and one coordinate covalent bond where both electrons in the bond come from the oxygen atom.
Analyzing these molecules, the correct molecule containing a coordinate covalent bond is:
E. Carbon monoxide (CO)
Thus, the correct answer is E: carbon monoxide (CO).
