1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
An organic compound $[\mathrm{X}]$ (molecular formula- $\mathrm{C}_5 \mathrm{H}_{11} \mathrm{NO}$ when reacted with $\mathrm{Br}_2$ / aq. NaOH yielded $[\mathrm{Y}]$ which reacts with $\mathrm{CHCl}_3$ and Ethanolic KOH to produce a foul smelling compound. Compound $[\mathrm{Y}]$ also reacts with HONO to produce Butan-1-ol with liberation of $\mathrm{N}_2(\mathrm{~g})$. Identify [X].
A
$\mathrm{CH}_3-\left(\mathrm{CH}_2\right)_3-\mathrm{CONH}_2$
B
$\mathrm{CH}_3-\left(\mathrm{CH}_2\right)_2-\mathrm{CO}-\mathrm{CH}_2-\mathrm{NH}_2$
C
$\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CO}-\left(\mathrm{CH}_2\right)_2-\mathrm{NH}_2$
D
$\mathrm{CH}_3-\left(\mathrm{CH}_2\right)_2-\mathrm{CH}\left(\mathrm{NH}_2\right)-\mathrm{CHO}$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Choose the correct statement.
A
Ionic compounds of $\mathrm{Sc}^{3+}$ and $\mathrm{Cu}^{+}$are coloured because of $\mathrm{d}-\mathrm{d}$ electronic transitions
B
The order in which the paramagnetic nature of the 4 cations $\mathrm{Cr}^{2+}, \mathrm{Mn}^{2+}, \mathrm{V}^{2+}$ and $\mathrm{Fe}^{2+}$ vary is $\mathrm{V}^{2+}<\mathrm{Cr}^{2+}=\mathrm{Mn}^{2+}<\mathrm{Fe}^{2+}$
C
As the oxidation number of the transition element increases, the ionic nature decreases and the oxides show acidic nature predominantly
D
The metal Cobalt has the electronic configuration $[\mathrm{Ar}] 3 \mathrm{~d}^5$ in the +3 oxidation state
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two statements, One Assertion (A) and the other Reason (R) are given. Choose the right option.

Assertion: The rate constant $(\mathrm{k})$ for a chemical reaction gets nearly doubled for a $10^0$ rise in temperature.

Reason: The number of bimolecular collisions between reactant molecules increase with increase in temperature

A
A is correct but R is wrong.
B
Both A and R are correct but R is not the correct explanation of A .
C
Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$.
D
A is wrong but R is correct.
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Which one of the following is a true statement with reference to reaction between 2- Bromo-2-methylpropane and aqueous KOH ?
A
The rate of reaction depends on the concentration of the haloalkane and the nucleophile $\mathrm{OH}^{-}$
B
The reaction occurs at a fast rate since the substrate is a tertiary alkyl halide and follows $\mathrm{S}_{\mathrm{N}} 1$ mechanism.
C
The reaction is not favoured by the presence of polar protic solvent.
D
The reaction occurs at a slow rate since it follows $\mathrm{S}_{\mathrm{N}} 2$ mechanism.
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