O-dichlorobenzene is the isomer of dichlorobenzene which has highest boiling point.
The boiling point of o-dichlorobenzene is greater than the boiling point of m -and p-dichlorobenzenes due to its greater polar nature. The boiling point order is: o−>m−>p− dichlorobenzene.
What is boiling point?
- Boiling point, the temperature at which the pressure exerted by the surroundings on a liquid equals the pressure exerted by the vapor of the liquid; under these conditions, the addition of heat has the effect of converting the liquid into its vapor without raising the temperature.
- At any temperature, the liquid partially evaporates into the space above it until the pressure exerted by the vapor reaches a characteristic value called the vapor pressure of the liquid at that temperature.
- As the temperature increases, the vapor pressure increases; at the boiling point, vapor bubbles form in the liquid.
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