Assertion: The order of basic strength in case of methyl substituted and ethyl substituted amines in aqueous state is different. Reason: Methyl group has stronger inductive effect than ethyl group.

Question

Assertion: The order of basic strength in case of methyl substituted and ethyl substituted amines in aqueous state is different. Reason: Methyl group has stronger inductive effect than ethyl group. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · Accepted Answer

In aqueous phase, the substituted ammonium cations get stabilised not only by electron releasing effect of alkyl group but also by solvation with water molecules. In case of

- C H_{3}

group, there is no steric hinderance to

H

-bonding, but in case of bigger groups there is steric hinderance and hence the order changes. In case of methyl substituted amines the order is

(C H_{3})_{2} N H > C H_{3} N H_{2} > (C H_{3})_{3} N > N H_{3}

and in ethyl substituted amines

(C_{2} H_{5})_{2} N H > (C_{2} H_{5})_{3} N > C_{2} H_{5} N H_{2} > N H_{3}

Q. Assertion : The order of basic strength in case of methyl substituted and ethyl substituted amines in aqueous state is different. Reason : Methyl group has stronger inductive effect than ethyl group.

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

Q. Assertion : The order of basic strength in case of methyl substituted and ethyl substituted amines in aqueous state is different.
Reason : Methyl group has stronger inductive effect than ethyl group.