Hydrogen Bonding

Q.

Suggest the most important type of intermolecular attractive interaction in the following pairs: n-Hexane and n-Octane

Q. The maximum possible number of hydrogen bonds in which a water molecule can participate is :

Q.

What is intermolecular hydrogen bonding?

Q.

What is the weakest of all intermolecular forces?

Q.

Define hydrogen bond. Is it weaker or stronger than the van der Waals forces?

Q.

Which of the following molecules show the presence of intramolecular hydrogen bonding?

1. Cellulose

2. $\mathrm{HCN}$

3. Concentrated Acetic Acid

4. ${\mathrm{H}}_2{\mathrm{O}}_2$

Q. The nature of inter-molecular forces among benzene molecules is:

1. Dispersion forces
2. Hydrogen Bonding
3. Ion-dipole interaction
4. Dipole-dipole interaction

Q.

Iodine molecules are held in the crystals lattice by ..............

(a) London forces (b) dipole-dipole interacions

(c) Covalent bonds (d) coulombic forces

Q.

Explain why inspite of nearly the same electronegativity, nitrogen forms hydrogen bonding while chlorine does not?

Q. The intermolecular interaction that is dependent on the inverse cube distance between the molecules is:

1. Hydrogen Bond
2. London dispersion force
3. Ion-dipole interaction
4. Ion-ion interaction

Q. The attractive forces between polar molecules are known as ________ forces and between non-polar molecules are known as ______ forces.

1. London dispersion, Dipole-dipole
2. Ion-dipole, Dipole-dipole
3. Dipole-induced dipole, London dispersion
4. Dipole-dipole, London dispersion

Q.

Name two intermolecular forces that exist between HF molecules in liquid state.

Q.

What is the strongest intermolecular force in Methanol?

Q. Two ice cubes are pressed together until they form one block. Which of the following force is primarily responsible for holding the cubes together?

1. Van der waals forces
2. Ionic interactions
3. Hydrogen bonding
4. Dipole dipole interaction

Q.

What is hydrogen bonding in water?

Q. The intermolecular force of attraction present between $N{H}_3$ and $C_6{H}_6$ is:

1. Dipole-dipole interaction
2. London dispersion force
3. H-bonding
4. Dipole-induced dipole interaction

Q. Which of the following molecules has the maximum dipole moment?

1. $C{O}_2$
2. $C{H}_4$
3. $N{H}_3$
4. $N{F}_3$

Q. Among the following mixtures, dipole-dipole as the major interaction, is present in?

1. Benzene and carbon tetrachloride
2. Benzene and ethanol
3. Acetonitrile and acetone
4. $KCl$ and water

Q.

Dipole-dipole forces act between the molecules possesing permanent dipole. Ends of dipoles posses 'partial charges'. The partial charge is

(a) more than unit electronic charge (b) equal to unit electronic charge

(c) less than unit electronic charge (d) double the unit electronic charge

Q. In which molecule is van der Waals force most likely to be important in determining the melting point and the boiling point?

1. $ICl$
2. $CO$
3. $B{r}_2$
4. $H_{2}S$

Q. Which pair of molecules has the strongest dipole–dipole interaction?

1. $N{H}_3$ and $N{H}_3$
2. $C{H}_4$ and $C{H}_4$
3. $C{O}_2$ and $C{O}_2$
4. $N{H}_3$ and $C{H}_4$

Q.

What bonds are hard to break?

Q. Which of the following factors is responsible for van der Waals forces ?

1. Dipole-dipole interaction and ion-induced dipole interaction
2. Instantaneous dipole-induced dipole interaction
3. All of these.
4. Dipole-induced dipole interaction and ion-induced dipole interaction

Q. The number of bridged oxygen atoms present in compound B formed from the following reactions is

1. $0$
2. $1$
3. $2$
4. $3$

Q.

The force of attraction between unlike molecules is called

1. cohesive force

2. adhesive force

3. bonding

4. none of these

Q. Match the following substances with their intermolecular forces:

List-I	List-II
(i) $C{H}_4$	(p) Dispersion Force
(ii) $NC{l}_3$	(q) Hydrogen Bonding
(iii) $C_4{H}_{9}OH$	(r) Dipole-dipole

1. (i) - (p), (ii) - (q), (iii) - (r)
2. (i) - (q) , (ii) - (p) , (iii) - (r)
3. (i) - (p) , (ii) - (r), (iii) - (q)
4. (i) - (r) , (ii) - (q) , (iii) - (p)

Q.

Describe the structure of the common form of ice.

Q.

Name the alcohol which has an intermolecular hydrogen bond.

Q.

What type of solid is dry ice?

Q.

Match the following:

(1)Non-polar Molecular solids (i) Coulombic or electrostatic forces

(2)H-Bonded Molecular solids (ii) H-bonding

(3)Ionic solids (iii) Metallic bonding

(4)Covalent solids (iv) Weak dispersion forces

(5)Metallic solids (v) dipole – dipole interaction

(vi) covalent Bonding

1. (1)-(iv), (2)-(ii), (3)-(i), (4)-(vi), (5)-(iii)

2. (1)-(iv), (2)-(ii), (3)-(iv), (4)-(vi), (5)-(iii)

3. (1)-(v), (2)-(i), (3)-(iv), (4)-(vi), (5)-(ii)

4. (1)-(iv), (2)-(ii), (3)-(iv), (4)-(vi), (5)-(iii)