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Covalent bonding multiple type question

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For the following question:

Which molecules react to form a dative/coordinate bond?

A. CH4 and NH3
B. C2H2 and Cl2
C. NH3 and HF
D. Cl2 and HF

The answer scheme says C is correct, but I do not see how two already complete molecules can form coordinate bonds. NH3 has a lone pair of electrons, HF having none. How can a coordinate bond between this lone pair and HF happen? I am confused.

The others are also equally confusing.
 

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The question asks in the product of each reaction, which has a dative coordinate bond? As far as I know, A does not react. You'll learn about B in organic chemistry. C is acid-base. D does not happen (F is above Cl). In NH4F, the fourth H is bonded to the lone pair of N, so that specific N-H bond is a dative coordinate bond. I won't explain why B isn't but you'll learn about it in organic. 

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