- At room temp, lower alcohols are colourless liquids
- The higher members are colourless odourless oxy solids
Boiling points of alcohols use much higher than aliphatic hydrocarbons and halo alkanes
Reason of forms hydrogen bonding and exists as associate molecules
The boiling points decreases with branching due to a corresponding decrease surface area. In the order primary > secondary > tertiary
The lower alcohols are highly soluble in water with increase in molecular mass the solubility gets decrease.
→ Solubility extent depends upon capability of its molecule to form Hydrogen bond with water
→ Molecule mass increases, hydrocarbon part becomes large, it resist the formation of (—H) bond and solubility decreases.
Ex. Alcohol Solubility
N-Butyl alcohol 7.9
N-Pentyl alcohols 2.3
Physiological action :-
Methanol is poisonous and not good for drinking purpose
On the other hand ethanol has intoxicating effect and is used for drinking purposes.
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