Question

when two species A and B form an electron pair bond and A does not provide its electron for bonding and the bond present between A and B must be​

Answer 1

Answer:

dative

Explanation:

when two species A and B form an electron pair bond and A does not provide its electron for bonding and the bond present between A and B must be called dative

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Answer 2

Answer:

The bond present between A and B must be​ coordinate bond or dative bond.

Explanation:

Coordinate bond is a type of covalent bond, the only difference is that the both electron for the formation of bond is provided by one atom. It is generally formed on coordination compounds between the metals and ligands.

• Coordinate bond are represented by an arrow pointing towards the atom received electrons. Therefore, coordinate bond are directional because the sharing of electrons happening in a particular direction.
• Coordinate bond are not similar to ionic bond because none of the atom will completely losing or gaining  the electrons.

Therefore, during formation of an electron pair bond between A and B, when A does not provide the electrons for bonding. It means that the coordinate bond formed between them, where A receives electrons from B. It can be represented as $A\longleftarrow:B$ or simply $A\longleftarrow B$.