MHT CET · Chemistry · Amines
Identify the CORRECT decreasing order of basic strength of compounds from following.
- A \(\mathrm{CH}_3 \mathrm{NH}_2>\left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2>\mathrm{NH}_3\)
- B \(\left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\mathrm{CH}_3 \mathrm{NH}_2>\mathrm{NH}_3>\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2\)
- C \(\mathrm{NH}_3>\mathrm{CH}_3\mathrm{NH}_2>\left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2\)
- D \(\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2>\left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\mathrm{CH}_3 \mathrm{NH}_2>\mathrm{NH}_3\)
Answer & Solution
Correct Answer
(B) \(\left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\mathrm{CH}_3 \mathrm{NH}_2>\mathrm{NH}_3>\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2\)
Step-by-step Solution
Detailed explanation
Arylamines in general are weaker bases than ammonia and aliphatic amines.
Aliphatic amines are stronger bases' than ammonia. Among aliphatic amines, \(2^{\circ}\) amine is a stronger base than \(1^{\circ}\) amine.
Hence, the correct decreasing order of basic strength is:
\(
\left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\mathrm{CH}_3 \mathrm{NH}_2>\mathrm{NH}_3>\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2
\)
Aliphatic amines are stronger bases' than ammonia. Among aliphatic amines, \(2^{\circ}\) amine is a stronger base than \(1^{\circ}\) amine.
Hence, the correct decreasing order of basic strength is:
\(
\left(\mathrm{CH}_3\right)_2 \mathrm{NH}>\mathrm{CH}_3 \mathrm{NH}_2>\mathrm{NH}_3>\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2
\)
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