Question

Which of the following represents the decreasing order of basic strength of amines in the gas phase?

• A. Tertiary amine $>$ Secondary amine $>$ Primary amine
• B. Tertiary amine $>$ Primary amine $>$ Secondary amine
• C. Primary amine $>$ Secondary amine $>$ Tertiary amine
• D. Secondary amine $>$ Tertiary amine $>$ Primary amine

Answer 1

The correct option is A Tertiary amine $>$ Secondary amine $>$ Primary amine

The following represents the decreasing order of basic strength of amines in the gas phase.

tertiary amine $>$ secondary amine $>$ primary amine

This is due +I (electron releasing) effect of alkyl groups. With an increase in the number of alkyl groups, the electron density on N increases and the lone pair of electrons can be easily donated.

Hence, the correct option is $A$