Consider the following compounds : C_2H_5NH_2, (C_2H_5)_2NH, C_6H_5CH_2NH_2, NH_3, C_6H_5NH_2 The correct increasing order of the above compounds on the basis of their basic strength is : (A) C_6H_5NH_2 < NH_3 < C_6H_5CH_2NH_2 < C_2H_5NH_2 < (C_2H_5)_2NH (B) NH_3 < C_6H_5NH_2 < C_6H_5CH_2NH_2 < C_2H_5NH_2 < (C_2H_5)_2NH (C) C_6H_5CH_2NH_2 < (C_2H_5)_2NH < NH_3 < C_6H_5NH_2 < C_2H_5NH_2 (D) C_2H_5NH_2 < C_6H_5NH_2 < NH_3 < C_6H_5CH_2NH_2 < (C_2H_5)_2NH

ChemistryCBSE Class 12 · Board exam 2026, set 56/5/1 · 1 mark · MCQ

CBSE Class 12 Chemistry 2026: question 10

Set in the CBSE Class 12 board exam of 2026, paper 56/5/1, section A, question 10, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q10 · 1 mark · MCQAmines

Consider the following compounds :
$C_{2} H_{5} N H_{2}, (C_{2} H_{5})_{2} NH, C_{6} H_{5} C H_{2} N H_{2}, N H_{3}, C_{6} H_{5} N H_{2}$
The correct increasing order of the above compounds on the basis of their basic strength is :

(A) $C_{6} H_{5} N H_{2} < N H_{3} < C_{6} H_{5} C H_{2} N H_{2} < C_{2} H_{5} N H_{2} < (C_{2} H_{5})_{2} NH$
(B) $N H_{3} < C_{6} H_{5} N H_{2} < C_{6} H_{5} C H_{2} N H_{2} < C_{2} H_{5} N H_{2} < (C_{2} H_{5})_{2} NH$
(C) $C_{6} H_{5} C H_{2} N H_{2} < (C_{2} H_{5})_{2} NH < N H_{3} < C_{6} H_{5} N H_{2} < C_{2} H_{5} N H_{2}$
(D) $C_{2} H_{5} N H_{2} < C_{6} H_{5} N H_{2} < N H_{3} < C_{6} H_{5} C H_{2} N H_{2} < (C_{2} H_{5})_{2} NH$

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 56/5/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Resonance of the lone pair reduces basicity.

Hint 2

Alkyl groups increase basicity through the +I effect.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

In aniline the lone pair is delocalised into the ring, so aniline is the weakest base, weaker than $N H_{3}$ .
The benzyl group sits between $N H_{3}$ and ethylamine. Diethylamine has two +I alkyl groups and is the strongest. Order: $C_{6} H_{5} N H_{2} < N H_{3} < C_{6} H_{5} C H_{2} N H_{2} < C_{2} H_{5} N H_{2} < (C_{2} H_{5})_{2} N H$ . Option (A).
1 mark

Answer: (A)

Where the marks are

Correct order (1 mark)

Revise the chapter

Chapter: Amines (notes, formulas, where marks are lost and every past question)
Topic: Basicity of Amines

Practise this chapterBoard-style questions from Amines, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 56/5/1: every question, by section.

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CBSE Class 12 Chemistry 2026: question 10

Hints

Step-by-step solution

Revise the chapter

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