TS EAMCET · Chemistry · Amines

Amine pK valine
A. N,N-Dimethyl aniline I. 9.30
B. Aniline II. 8.92
C. N-Ethylethanamine III. 9.38
D. N-Methylaniline IV. 3.00

A A-II, B-III, C-IV, D-I
B A-II, B-IV, C-III, D-I
C A-III, B-IV, C-I, D-II
D A-IV, B-III, C-II, D-I

Verified Solution

Answer & Solution

Correct Answer

(A) A-II, B-III, C-IV, D-I

Step-by-step Solution

Detailed explanation

A lower \(\mathrm{pK}_{\mathrm{b}}\) value indicates a stronger base. In 'C' presence of two alkyl group make it stronger base as compare of \(\mathrm{A}, \mathrm{C}\) and D in which resonance is present. In 'A' two methyl group present due to + I effect of methyl group more…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Amine	pK valine
A. N,N-Dimethyl aniline	I. 9.30
B. Aniline	II. 8.92
C. N-Ethylethanamine	III. 9.38
D. N-Methylaniline	IV. 3.00

AminepK valineA. N,N-Dimethyl anilineI. 9.30B. AnilineII. 8.92C. N-EthylethanamineIII. 9.38D. N-MethylanilineIV. 3.00

Step-by-step Solution

Amine pK valine
A. N,N-Dimethyl aniline I. 9.30
B. Aniline II. 8.92
C. N-Ethylethanamine III. 9.38
D. N-Methylaniline IV. 3.00