1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

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

Assertion: 2-aminoethanoic acid and p-aminobenzene sulphonic acid can exist as Zwitter ions while p-aminobenzoic acid cannot.

Reason: When the acid group is a relatively strong proton donor and the $-\mathrm{NH}_2$ group is sufficiently basic it can accept a $\mathrm{H}^{+}$ion from the acid group to form the dipolar ion.

A
Both A and R are correct and R is the correct explanation of A .
B
A is correct but R is wrong.
C
A is wrong but R is correct.
D
Both A and R are correct but R is not the correct explanation of A .
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
$\mathrm{X} \rightarrow 2 \mathrm{Y}$ is a first order reaction where $1.0 \mathrm{~mol} / \mathrm{L}$ of the reactant yields $0.4 \mathrm{~mol} / \mathrm{L}$ of Y in 200 minutes. Calculate the half-life period of the reaction in minutes.
A
151.24
B
203.69
C
620.96
D
271.34
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Match the reactions of Glucose given in Column I with the major product formed in the reaction as in Column II.

Column I - Reactions Column II - Major product
A. $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+\mathrm{HI}$ (Heat) P. $\mathrm{HOOC}-(\mathrm{CHOH})_4-\mathrm{COOH}$
B. $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+\mathrm{Br}_2(\mathrm{aq})$ Q. $\mathrm{CH}_3-\left(\mathrm{CH}_2\right)_4-\mathrm{CH}_3$
C. $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+$ Conc. $\mathrm{HNO}_3$ R. $\mathrm{NH}_4 \mathrm{O}-\mathrm{OC}-(\mathrm{CHOH})_4-\mathrm{CH}_2 \mathrm{OH}$
D. $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+2\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right] \mathrm{OH}$ S. $\mathrm{HOOC}-(\mathrm{CHOH})_4-\mathrm{CH}_2 \mathrm{OH}$

A
$\mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{R} \quad \mathrm{C}=\mathrm{Q} \quad \mathrm{D}=\mathrm{P}$
B
$A=P \quad B=S \quad C=Q \quad D=R$
C
$\mathrm{A}=\mathrm{R} \quad \mathrm{B}=\mathrm{P} \quad \mathrm{C}=\mathrm{S} \quad \mathrm{D}=\mathrm{Q}$
D
$\mathrm{A}=\mathrm{Q} \quad \mathrm{B}=\mathrm{S} \quad \mathrm{C}=\mathrm{P} \quad \mathrm{D}=\mathrm{R}$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A certain gas absorbs photon of wavelength $4.0 \times 10^{-7} \mathrm{~m}$ and emits radiation at two wavelengths. If one of the emissions occurs at $7.5 \times 10^{-7} \mathrm{~m}$, what is the wavelength at which the second emission occurs?
A
650 nm
B
857 nm
C
700 nm
D
680 nm
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