Q.

BF3 easily reacts with Lewis base such as NH3 to complete octet around boron. This can be expressed as

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a

F3 B+:NH3⟶F3 B←NH3

b

F3 B+:NH3⟶F3 B→NH3

c

:BF3+NH3⟶BF3→NH3

d

:BF3+NH3⟶BF3←NH3

answer is A.

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Detailed Solution

The monomeric trihalides of elements of group 13, being electron deficient, are strong Iewis acids. Boron trifluoride easily reacts with Lewis bases such as NH3 to complete its octet around boron.F3 B+:NH3⟶F3 B←NH3
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