AP EAMCET · Chemistry · General Organic Chemistry
The order of basic strength of methyl substituted amines and \(\mathrm{NH}_3\) in aqueous solution is
- A \(\left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\mathrm{CH}_3 \mathrm{NH}_2>\left(\mathrm{CH}_3\right)_3 \mathrm{~N}>\mathrm{NH}_3\)
- B \(\left(\mathrm{CH}_3\right)_3 \mathrm{~N}>\left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\mathrm{CH}_3 \mathrm{NH}_2>\mathrm{NH}_3\)
- C \(\left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\mathrm{CH}_3 \mathrm{NH}_2>\mathrm{NH}_3>\left(\mathrm{CH}_3\right)_3 \mathrm{~N}\)
- D \(\mathrm{NH}_3>\mathrm{CH}_3 \mathrm{NH}_2>\left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\left(\mathrm{CH}_3\right)_3 \mathrm{~N}\)
Answer & Solution
Correct Answer
(A) \(\left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\mathrm{CH}_3 \mathrm{NH}_2>\left(\mathrm{CH}_3\right)_3 \mathrm{~N}>\mathrm{NH}_3\)
Step-by-step Solution
Detailed explanation
Three effects are most useful to decide basic character of simple aliphatic amines in aqueous solution. (i) Inductive effect, which favour tertiary amine to be more basic due to greater \(+I\) effect of three alkyl groups directly attached to nitrogen. (ii) Solution effect,…
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