1
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Identify the Reagents I and II to be used in the course of the given reactions.

COMEDK 2024 Morning Shift Chemistry - Aldehyde and Ketone Question 15 English

A
$$ \text { Reagent I: DIBAL- } \mathrm{H} / \mathrm{H}_2 \mathrm{O} \quad \text { Reagent II: conc. } \mathrm{KOH} / \text { heat } $$
B
$$ \text { Reagent I: } \mathrm{Zn} / \mathrm{Hg} \text { in conc. } \mathrm{HCl} \quad \text { Reagent II: }\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right]^{+} $$
C
$$ \text { Reagent I: } \mathrm{NH}_2 \mathrm{NH}_2 / \mathrm{KOH} \quad \text { Reagent II: } \mathrm{Cr}_2 \mathrm{O}_7{ }^{2-} / \mathrm{H}^{+} $$
D
$$ \text { Reagent I: } \mathrm{H}_2 / \mathrm{Pd}-\mathrm{BaSO}_4 \quad \text { Reagent II: } \mathrm{CrO}_3 /\left(\mathrm{CH}_3 \mathrm{CO}\right)_2 $$
2
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Given below are 4 species with one odd electron on the Carbon atom.

$$\begin{array}{ll} \mathrm{A}=\left(\mathrm{CH}_3\right)_3 \stackrel{\bullet}{\mathrm{C}} & \mathrm{B}=\left(\mathrm{C}_6 \mathrm{H}_5\right)_3 \stackrel{\bullet}{\mathrm{C}} \\ \mathrm{C}=\left(\mathrm{C}_6 \mathrm{H}_5\right)_2 \stackrel{\bullet}{\mathrm{C}} \mathrm{H} & \mathrm{D}=\left(\mathrm{CH}_3\right)_2 \stackrel{\bullet}{\mathrm{C}} \mathrm{H} \end{array} $$

Choose the correct decreasing order of stability of the species.

A
A > B > C > D
B
B > C > A > D
C
D > A > C > B
D
A > B > D > C
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which one of the following compounds when reacted with $$\mathrm{NaOH}$$ (aq) undergoes Substitution Nucleophilic Bimolecular reaction with retention of configuration?

A
COMEDK 2024 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 21 English Option 1
B
COMEDK 2024 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 21 English Option 2
C
COMEDK 2024 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 21 English Option 3
D
COMEDK 2024 Morning Shift Chemistry - Haloalkanes and Haloarenes Question 21 English Option 4
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A statement of Assertion followed by a statement of Reason is given. Choose the correct answer out of the following options.

Assertion: The Eclipsed and the Staggered conformations of Ethane continuously flip from one form to the other.

Reason: The torsional barrier between the Conformers of Ethane has a high value of about $$50 \mathrm{~kJ} / \mathrm{mol}$$ and this restricts free rotation around $$\mathrm{C}-\mathrm{C}$$ bond.

A
Assertion is incorrect but Reason is correct statement.
B
Both Assertion and Reason are incorrect statements.
C
Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
D
Assertion is correct but Reason is incorrect statement.
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