Column-I and Column-II contains four entries each. Entries of Column -I are to be matched with some entries of Column-II. One or more than one entries of Column-I may have the matching with the same entries of Column-II.

Answer

A, B, C, D

Explanation

`implies`
`to2p_(pi)-3d_(pi)` back bond
`to` can exhibit intermolecular H-bonding as H-atom is bound in O-atom.
`to` Proton donor acid: basicity=4
`implies`
`to` back is absent.
`to`can form intermolecular H-bonding as H-atom is directly bounded to O-atom
`to`Proton donor acid, basicity=2
`to` Hypervalent, Number of `e^(-)` at Se=12
`implies`
`to2p_(pi)-2d_(pi)` back bond of present
`to`Hypervalent as number of `e^(-)s` atj B-atom=6
`to` does not fornish `H^(+)`
`implies`
`to2p_(pi)-2d_(pi)` back bond is present
`to` can form intermolecular H-bonding as H-atom is directly bonded to N-atom hypervalent number of `e^(-)s` B-atom=6
`to` Does not furnish `H^(+)`