BF3 does not have protons but still acts as an acid.why?

1.	BF3 does not have protons but still acts as an acid.why?
Answer» B has vaccant orbital and it accept electron so act as lewis acid<br>Acc to Lewis, a substance is an acid only when its octet is not complete.Also, in BF3 its octet is not complete.Thus, BF3 act as an acid even it is not having a proton.

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