Answer:
HCl is a Bronsted acid, dissociates partially or completely with the release of H+ dissociating as H+ and Cl-.
BF_3 is a Lewis acid because it has an incomplete octet and an empty 2p orbital, so it can accept a lone pair. It is clearly not a Bronsted acid as it does not have a H+ to release on dissociation.
CCl_3 Lewis base
-H Lewis base
CH_2O Bronsted base
CH_3Cl Bronsted acid
-OCH_3 Lewis base
NH_3 is a Lewis Base:, N has a a lone pair which it can donate to a Lewis acid like BF3.
Explanation:
The Brønsted-Lowry theory describes acid-base interactions in terms of proton transfer between chemical species. A Brønsted-Lowry acid is any species that can donate a proton, H+, and a base is any species that can accept a proton. As for chemical structure, this means that any Brønsted-Lowry acid must contain a hydrogen that can be dissociated as H+. To accept a proton, a Brønsted-Lowry base must have at least one solitary pair of electrons to form a new bond with a proton.