How do these molecular orbitals differ from those obtained from linear combinati

Question

How do these molecular orbitals differ from those obtained from linear combinations of the 2p_y atomic orbitals? (The 2p_y orbitals are also oriented perpendicular to the bonding axis, but also perpendicular to the 2p. orbitals.) Molecular orbitals obtained from linear combinations of the 2p_y atomic orbitals do not differ from other MOs.? When the p_z and p_z orbitals combine, similar bonding and antibonding molecular orbitals form. The only difference between the resulting MOs is a rotation about the internuclear axis. The energies and the names of the bonding and antibonding MOs obtained from the combination of the p_z atomic orbitals are identical to those obtained from the combination of the p_y atomic orbitals, which lie in front of and behind the internuclear axis. When the p_z and p_z orbitals combine, similar bonding and antibonding molecular orbitals form. The minor difference between the resulting MOs is a rotation about the internuclear axis. The energies and the names of the bonding and antibonding MOs obtained from the combination of the p_z atomic orbitals are identical to those obtained from the combination of the p_x atomic orbitals, which lie in front of the internuclear axis. Explain why CO_2 and CCl_4 are both nonpolar even though they contain polar bonds.

Explanation / Answer

1) Molecular orbital obtained from linear combination of 2Py atomic orbitals do not differ from other MOs

( all three P orbitals Px,Py,Pz are identical)

2) both CO2 and CCl4 are non-polar because vector quanity of polarity is zero. That means in CO2 both O are located exactly opposite side with equal distance dipole moment of each CO bond will have same magnetitude with opposite sign. This is same in case of CCl4 also .

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