Question

The correct sequence of base strengths in aqueous solution is

• A. \( (CH_3)_2NH>CH_3NH_2>(CH_3)_3N \)
• B. \( CH_3NH_2>(CH_3)_2NH>(CH_3)_3N \)
• C. \( (CH_3)_2NH>(CH_3)_3N>CH_3NH_2 \)
• D. \( (CH_3)_3N>(CH_3)_2NH>CH_3NH_2 \)

Hint:

Alkyl groups are electron-donating, increasing the basicity of the amines as their number increases.

Answer 1

The Correct Option is A

Step 1: Understanding base strengths.
The basicity of amines is influenced by the availability of the lone pair of electrons on nitrogen. In alkylamines, as the number of alkyl groups increases, the electron-donating ability increases, making the amine more basic.

Step 2: Conclusion.
Thus, the correct order of base strengths is \( (CH_3)_2NH>CH_3NH_2>(CH_3)_3N \).

Final Answer: \[ \boxed{\text{(A) } (CH_3)_2NH>CH_3NH_2>(CH_3)_3N} \]