For which of the following parameters the structural isomers  C_2H_5OH and CH_3OCH_3 would be expected to have the same values? (Assume ideal behaviour)

  • Option 1)

    Heat of vaporisation

  • Option 2)

    Vapour pressure at the same temperature

  • Option 3)

    Boiling points

  • Option 4)

    Gaseous densities at the same temperature and pressure.

 

Answers (1)

As we learnt in 

Physical properties of ether -

–  Insoluble in water except dimethyl ether.

–  Show dipole moment due to  C - O polar bond.

–  Boiling points of ether are lower than isomeric alcohol.Due to the presence of H-bonding in alcohol.

-

 

 All the parameters will be different except the gaseous densities due to the presence of H-Bonding in alcohol which is absent in ether


Option 1)

Heat of vaporisation

This option is incorrect

Option 2)

Vapour pressure at the same temperature

This option is incorrect

Option 3)

Boiling points

This option is incorrect

Option 4)

Gaseous densities at the same temperature and pressure.

This option is correct

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