Ionic bond is defined as the electrostatic force of attraction holding the oppositely charged ions. Ionic compounds are mostly crystalline solid having high melting and boiling points, electrical conductivity in moleten state, solubility in water etc. Covalent bond is defined as the force which binds atoms of same or different elements by mutual sharing of electrons in a covalent bond. Covalent compounds are solids, liquids or gases. They have low melting and boiling points compounds. They are more soluble in non-polar solvents.
Which of the following is arranged order of increasing boiling point ?

Options

A. `H_(2)O lt C Cl_(4) lt CS_(2) lt CO_(2)`
B. `CO_(2) lt CS_(2) lt C Cl_(4) lt H_(2)O`
C. `CS_(2)H_(2)O lt CO_(2) lt C Cl_(4)`
D. `C Cl_(4) lt H_(2)O lt CO_(2) lt CS_(2)`

Answer

To determine the order of increasing boiling points for the given compounds, we need to consider the molecular mass and the type of intermolecular forces present in each compound.

### Step-by-Step Solution:

1. **Identify the Compounds and Their Molecular Masses**:
- **H2O (Water)**: Molecular mass = 18 g/mol
- **CO2 (Carbon Dioxide)**: Molecular mass = 44 g/mol
- **CS2 (Carbon Disulfide)**: Molecular mass = 76.139 g/mol
- **CCl4 (Carbon Tetrachloride)**: Molecular mass = 153.82 g/mol

2. **Consider Intermolecular Forces**:
- **H2O** exhibits hydrogen bonding, which is a strong intermolecular force, leading to a higher boiling point.
- **CO2** has weak London dispersion forces since it is a nonpolar molecule.
- **CS2** also has weak London dispersion forces but has a higher molecular mass than CO2, which could lead to a higher boiling point.
- **CCl4** has weak London dispersion forces as well, but its high molecular mass suggests a higher boiling point compared to CO2 and CS2.

3. **Rank the Compounds Based on Boiling Points**:
- **Lowest Boiling Point**: CO2 (due to weak intermolecular forces)
- **Next**: H2O (due to strong hydrogen bonding)
- **Next**: CS2 (higher molecular mass than CO2, but no strong intermolecular forces)
- **Highest Boiling Point**: CCl4 (highest molecular mass)

4. **Final Order of Increasing Boiling Points**:
- CO2 < H2O < CS2 < CCl4

### Conclusion:
The correct order of increasing boiling points is:
**CO2 < H2O < CS2 < CCl4**