Quiz | Bonding Theories

1

The double bond of an alkene is composed of:

1 σ + 1 π bond

1 σ + 1 lone pair of electrons

2 σ bonds

2 π bonds

Double bond: 1 σ + 1 π bond

2

Which of the following statements about σ molecular orbital is incorrect?

It may result from overlap of p atomic orbitals perpendicular to the molecular axis

It may result from overlap of 2 s atomic orbitals

It may be either bonding or antibonding

None of the above

3

What type of hybrid orbitals are involved in bonding of CO2?

sp

sp2

sp3

sp3d

2 electron groups around the central carbon atom (2 neighboring atoms + 0 lone pair) ⇒ sp hybridization

4

What type of hybrid orbitals are involved in bonding of ClO3-?

sp

sp2

sp3

sp3d

4 electron groups around the central chlorine atom (3 neighboring atoms + 1 lone pair) ⇒ sp3 hybridization

5

Which of the following statements is incorrect?

Bonding MO is lower in energy than the AOs

Number of hybrid orbitals formed = number of atomic orbitals combined

sp3d hybridization is the combination of 1 s-orbital + 3 p-orbitals + 1 d-orbital

2 overlapping atomic orbitals may form 2 bonding molecular orbitals

2 overlapping atomic orbitals form 1 bonding MO and 1 antibonding MO

6

What is the number of unpaired electrons in the B2 molecule?

0

1

2

4

electronic configuration of B (Z = 5): 1s2 2s2 2p1

electronic configuration of B2: (σ1s)2 (σ*1s)2 (σ2s)2 (σ*2s)2 (π2py) (π2pz) ⇒ 2 unpaired electrons