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1
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
Which of the following is the most stable free radical?
A
$\left(\mathrm{C}_6 \mathrm{H}_5\right)_2 \dot{\mathrm{C}} \mathrm{H}$
B
$\dot{\mathrm{C}} \mathrm{H}_3$
C
$\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}$
D
$\mathrm{CH}_2=\dot{\mathrm{C}} \mathrm{H}$
2
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

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

Assertion: Heterocyclic compounds like Pyridine and Thiophene are non-aromatic compounds.

Reason: According to Huckel rule for a given compound to exhibit aromaticity, the molecule must be planar, cyclic system having delocalised $(4 n+2) \pi$ electrons.

A
Assertion is correct but Reason is incorrect.
B
Both Assertion and Reason are incorrect.
C
Reason is correct but Assertion is incorrect.
D
Both Assertion and Reason are correct.
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Arrange the following free radicals in the increasing order of their stability:

A B C D
COMEDK 2025 Morning Shift Chemistry - General Organic Chemistry Question 3 English 1 COMEDK 2025 Morning Shift Chemistry - General Organic Chemistry Question 3 English 2 COMEDK 2025 Morning Shift Chemistry - General Organic Chemistry Question 3 English 3 COMEDK 2025 Morning Shift Chemistry - General Organic Chemistry Question 3 English 4

A
$\mathrm{A}<\mathrm{B}<\mathrm{D}<\mathrm{C}$
B
$\mathrm{C}<\mathrm{D}<\mathrm{B}<\mathrm{A}$
C
$\mathrm{C}<\mathrm{B}<\mathrm{D}<\mathrm{A}$
D
$\mathrm{A}<\mathrm{B}<\mathrm{C}<\mathrm{D}$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Arrange the following in the decreasing order of their $\mathrm{pK}_{\mathrm{a}}$ values.

COMEDK 2025 Morning Shift Chemistry - General Organic Chemistry Question 4 English

A
$\mathrm{A}>\mathrm{C}>\mathrm{D}>\mathrm{B}$
B
$\mathrm{C}>\mathrm{A}>\mathrm{B}>\mathrm{D}$
C
$\mathrm{B}>\mathrm{D}>\mathrm{C}>\mathrm{A}$
D
$\mathrm{D}>\mathrm{C}>\mathrm{A}>\mathrm{B}$
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