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Which of the following pairs form a stable coordinate bond ?

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Which of the following pairs form a stable coordinate bond ?
A. NaOH. HCl
B. `NH_3H_2O`
C. `NH_3BF_3`
D. `BF_3BCl_3`
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Correct Answer - C
`NH_3` acts as a Lewis base due to the presence of lone pair which it donates to `BF_3` for the formation of a coordinate bond. `BF_3` is an electron deficient molecule.
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