Chemical Bonding and Molecular Structure

Identify a molecule which does not exist.

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

Which of the following diatomic molecular species has only bonds according to Molecular Orbital Theory?

1. C2
2. Be2
3. O2
4. N2

Consider the following species : CN+, CN-, NO and CN. Which one of these will have the highest bond order?

1. NO
2. CN-
3. CN+
4. CN

In the structure of ClF3, the number of lone pairs of electrons on central atom ‘Cl’ is

1. one
2. two
3. four
4. three

Which of the following pairs of compounds is isoelectronic and isostructural ?

1. TeI2, XeF2
2. IBr2-, XeF2
3. IF3, XeF2
4. BeCl2, XeF2

The species, having bond angles of 120 is

1. ClF3
2. NCl3
3. BCl3
4. PH3

Which one of the following pairs of species have the same bond order ?

1. O2, NO+
2. CN-, CO
3. N2, O2-
4. CO, NO

Consider the molecules CH4, NH3 and H2O. Which of the given statements is false?

1. The H-O-H bond angle in H2O is smaller than the H-N-H bond angle in NH3.
2. The H-C-H bond angle in CH4 is larger than the H-N-H bond angle in NH3.
3. The H-C-H bond angle in CH4, the H-N-H bond angle in NH3, and the H-O-H bond angle in H2O are all greater than 90 .
4. The H-O-H bond angle in H2O is larger than the H-C-H bond angle in CH4.

Predict the correct order among the following :

1. bond pair - bond pair > lone pair - bond pair > lone pair - lone pair
2. lone pair - bond pair > bond pair - bond pair > lone pair - lone pair
3. lone pair - lone pair > lone pair - bond pair > bond pair - bond pair
4. lone pair - lone pair > bond pair - bond pair > lone pair - bond pair

Which one of the following compounds shows the presence of intramolecular hydrogen bond?

1. H2O2
2. HCN
3. Cellulose
4. Concentrated acetic acid