According to VBT any covalent bond will be formed by overlapping of atomic orbitals of bonded atoms provided atomic orbitals must be half-filled and electrons be in opposite spin. According to type of overlapping covalent bonds can be classified as (a)` sigma`-bond (b) `pi`-bond (c ) `delta`-bond :
The combination of orbital that can not produce non-bonding molecular orbital is (internuclear axis is z-axis ) :

Options

A. `p_(y)+d_(x^(2)-y^(2))`
B. `p_(z)+d_(yz)`
C. `s+d_(xz)`
D. `d_(xy)+d_(xy)`

Answer

D

Explanation

`(a) implies p_(y)+d_(x^(2)-y^(2))` : can produce non-bonding if inter-nuclear axis is either x,y or z-axis
`(b) implies p_(z)+d_(yz)` : can produce non-bonding if inter-nuclear axis is either x,y or z-axis
(c )` implies s+d_(xz)` : will always form non-bonding inrrepective of inter-nuclear axis
(d) `implies d_(xy)+d_(xy)` : either form `pi` bond if inter-nuclear axis is `x//y` axis or can also form `delta`-bond if inter nuclear axis is z-axis.