Chemical Bonding and Molecular Structure

The correct order of energies of molecular orbitals of N2 molecule, is

1. 1s < 1s < 2s < 2s < 2pz < ( 2px = 2py) < ( 2px = 2py) < 2pz
2. 1s < 1s < 2s < 2s < 2pz < 2pz < ( 2px = 2py) < ( 2px = 2py)
3. 1s < 1s < 2s < 2s < ( 2px = 2py) < ( 2px = 2py) < 2pz < 2pz
4. 1s < 1s < 2s < 2s < ( 2px = 2py) < 2pz < ( 2px = 2py) < 2pz

Amongst the following which one will have maximum 'lone pair - lone pair' electron repulsions?

1. ClF3
2. IF5
3. SF4
4. XeF2

Which amongst the following is incorrect statement?

1. The bond orders of O2+, O2, O2- and O22- are 2.5, 2, 1.5 and 1, respectively
2. C2 molecule has four electrons in its two degenerate molecular orbitals
3. H2+ ion has one electron
4. O2+ ion is diamagnetic

Match List-I with List-II : Choose the correct answer from the options given below :

1. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
2. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
3. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
4. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

The correct order of bond angles in the following compounds/species is :

1. CO2 < NH3 < H2O < +NH4
2. H2O < NH3 < +NH4 < CO2
3. H2O < +NH4 < NH3 < CO2
4. H2O < +NH4 = NH3 < CO2

BF3 is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are :

1. sp2 and 8
2. sp3 and 4
3. sp3 and 6
4. sp2 and 6

Match List - I with List - II : Choose the correct answer from the options given below.

1. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
2. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
3. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
4. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

Which of the following molecules is non-polar in nature?

1. NO2
2. POCl3
3. CH2O
4. SbCl5

Which of the following set of molecules will have zero dipole moment?

1. Boron trifluoride, hydrogen fluoride, carbon dioxide, 1, 3-dichlorobenzene
2. Nitrogen trifluoride, beryllium difluoride, water, 1, 3-dichlorobenzene
3. Boron trifluoride, beryllium difluoride, carbon dioxide, 1, 4-dichlorobenzene
4. Ammonia, beryllium difluoride, water, 1, 4-dichlorobenzene

Identify a molecule which does not exist.

1. Li2
2. C2
3. O2
4. He2