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

Identify the wrong statement from the following

A

$\mathrm{S}_{\mathrm{N}} 1$ reaction of Alkyl halides is favoured by the presence of bulky substituents, protic solvents and the reaction products are a racemic mixture

B

Vinyl halides do not undergo nucleophilic substitution reaction easily c.

C

The product formed when (-)-2-Methylbutan-1-OI is heated with Conc. HCl is (+)-1-Chloro-2-methylbutane with Retention of configuration

D

$\mathrm{S}_{\mathrm{N}} 2$ reaction of optically active halides are accompanied by Retention of configuration

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

Etard reaction is a method of preparation of benzaldehyde by oxidation of toluene. The oxidizing agent used in this reaction is:

A

Chromic oxide

B

Chromyl chloride

C

Potassium dichromate

D

Pyridinium chlorochromate

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

When 2-butyne is treated with dilute $\mathrm{H}_2 \mathrm{SO}_4 / \mathrm{HgSO}_4$, the product formed is:

A

Butanal

B

1-butanol

C

Butanone

D

2-butanol

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

Two statements, one Assertion and the other Reason are given. Choose the right option.

Assertion: The Molar conductivity of KCl increases very slowly with dilution and approaches a limiting value when dilution is infinite.

Reason: In case of KCl there is an increase in the number of ions on dilution due to complete ionisation at infinite dilution.

A

Both Assertion and Reason are correct and Reason is the correct explanation of Assertion

B

Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion

C

Assertion is incorrect but Reason is correct

D

Assertion is correct but Reason is incorrect