Define moleuclar orbital. What are the salient features of Molecular orbital theory?

Give at least two differences between atomic and molecular orbitals.

Give three points of difference between hybrid orbitals and molecular orbitals ?

What is a linear combination of atomic orbitals (LCAO) far obtaining molecular orbitals ?

Give the points of difference betweeen bonding and antibonding molecular orbitals.

Write the important conditions required for the linear combination of atomic orbitals to form molecular orbitals.

Write the significance of a plus and minus sign shown in representing the orbitals.

218. Considering x–axis as the internuclear axis which out of the following will not form a sigma bond and why? (a) 1 s and 1 s (b) 1 s and 2p_x : (c) 2p_y and 2p_y (d) 1s and 2s. 

Assuming Z-axis as molecular (or internuclear) axis, label the molecular orbtials formed by the following combinations of atomic orbitals: (i) 1 s + 1 s   (ii) 2p_y – 2p_v (iii) 2_Pz – 2_pz.

Discuss the shapes of molecular orbitals formed by the combination of the following atomic orbitals. (lateral overlap)
(i)2p_x + 2p_y     (ii)   2p_z – 2p_z