Question

Ethyl alcohol ($C_2{H}_{5}OH$) has higher boiling point than dimethyl ether ($C{H}_3-O-C{H}_3$) although the molecular weight of both are same due to:

• A. intramolecular $H-$bonding
• B. intermolecular $H-$bonding
• C. dipole moment
• D. lattice enthalpy.

Answer 1

Answer: (B)

intermolecular $H-$bonding

Ethyl alcohol($C_2{H}_{5}OH$) has intermolecular hydrogen bonds, although the molecular weight of ethyl alcohol and dimethyl ether($C{H}_3-O-C{H}_3$) is same but the ether is not much electronegative as ethyl alcohol to form the hydrogen bond.

That is the reason ethyl alcohol has the higher boiling point than ether.

So the correct option is [B].