1
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following is the correct reaction of Hinsberg's reagent with primary, secondary and tertiary amines?

A

Primary amine forms N , N -dialkyl Benzene sulphonamide which is soluble in alkali

B

Tertiary amine forms N, N-dialkyl Benzene sulphonamide which is insoluble in alkali

C

Secondary amine forms N, N-dialkyl Benzene sulphonamide which is soluble in alkali

D

Primary amine forms N -alkyl Benzene sulphonamide which is soluble in alkali

2
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The Bohr orbit of the hydrogen atom ( $n=1$ ) is $0.530 \mathop {\rm{A}}\limits^{\rm{o}} $. The radius of the first excited state orbit in $\mathop {\rm{A}}\limits^{\rm{o}} $ is:

A

0.16

B

5.21

C

1.66

D

2.12

3
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following is NOT TRUE about nucleophilic addition reactions of aldehydes?

A

2,4 DNP derivatives are useful to identify aldehydes and ketones

B

Hemiacetals are gem-dialkoxy compounds

C

The hydrogensulphite addition product is useful for separation and purification of aldehydes

D

Aldehydes and ketones react very slowly with pure HCN to yield cyanohydrins

4
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$ \text { The solution of } \boldsymbol{d} \boldsymbol{y}=\boldsymbol{\operatorname { c o s }} \boldsymbol{x}(\mathbf{2}-\boldsymbol{y} \boldsymbol{\operatorname { c o s e c }} \boldsymbol{x}) \boldsymbol{d} \boldsymbol{x} \quad \text { where } y=\sqrt{2} \text { when } x=\frac{\boldsymbol{\pi}}{4} \text { is } $$

A

$y=\sin x+\frac{1}{2} \operatorname{cosec} x$

B

$y=\tan \left(\frac{x}{2}\right)+\cot \left(\frac{x}{2}\right)$

C

$y \sin x=\frac{1}{2} \cos 2 x$

D

$y=\frac{1}{\sqrt{2}} \sec x+\sqrt{2} \cos \left(\frac{x}{2}\right)$