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

Which of the following is an INCORRECT match?

A

First lonization Enthalpies - $N aA l

B

Metallic character      - $A l>M g>B>K$

C

lonic size $\quad\quad-\quad \mathrm{Na}^{+}>\mathrm{Mg}^{+2}>\mathrm{Al}^{+3}>\mathrm{Si}^{+4}$

D

Electron Gain enthalpy $\quad-\mathrm{F}<\mathrm{Cl}>\mathrm{Br}>\mathrm{I}$

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

Two statements $[A]$ and $[B]$ are given below. Choose the correct option.

A) Protonated $\mathrm{R}-\mathrm{C} \mathrm{H}_2-\mathrm{OH}$ can serve as Electrophiles while neutral $\mathrm{R}-\mathrm{OH}$ acts as a Nucleophile.

B) The bond between $\mathrm{O}-\mathrm{H}$ cleaves when $\mathrm{R}-\mathrm{CH}_2-\mathrm{OH}$ acts as Electrophiles and the bond between $\mathrm{C}-\mathrm{O}$ cleaves when they act as Nucleophiles.

A

Both the statements $[A]$ and $[B]$ are correct

B

Both the statements $[A]$ and $[B]$ are wrong

C

Statement $[B]$ is correct but $[A]$ is wrong

D

Statement $[\mathrm{A}]$ is correct but $[\mathrm{B}]$ is wrong

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

The frequency of photon which is emitted during a transition of electron of $\mathrm{He}^{+}$ion from fifth energy level to third energy level will be:

A

$1.34 \times 10^{-14} \mathrm{~s}^{-1}$

B

$9.39 \times 10^{14} \mathrm{~s}^{-1}$

C

$2.34 \times 10^{14} \mathrm{~s}^{-1}$

D

$8.29 \times 10^{-14} \mathrm{~s}^{-1}$

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

$$ \text { Match the reactions in List I with the final products formed as given in List II. } $$

$$
\text { List I }
$$
$$
\text { List II }
$$
W $$
\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_3 \frac{(\text { i }) \mathrm{CrO}_3+\left(\mathrm{CH}_3 \mathrm{CO}\right)_2 \mathrm{O}}{(\text { ii }) \mathrm{H}_3 \mathrm{O}+\text { heat }} \rightarrow
$$
P $$
\mathrm{R}_2 \mathrm{CO}
$$
X $$
\mathrm{RCOOC}_2 \mathrm{H}_5 \frac{(\text { i) } D I B A L-H}{(\text { ii }) \mathrm{H}_2 \mathrm{O}} \rightarrow
$$
Q $$
\mathrm{C}_6 \mathrm{H}_5 \mathrm{COCH}_3
$$
Y $$
R C N \frac{(i) R-\mathrm{Mg}-\mathrm{X} / \text { dry ether }}{(i i) \mathrm{H}_3 \mathrm{O}^{+}} \rightarrow
$$
R $$
\mathrm{C}_6 \mathrm{H}_5 \mathrm{CHO}
$$
Z $$
\mathrm{C}_6 \mathrm{H}_5 \mathrm{COCl}+\left(\mathrm{CH}_3\right)_2 \mathrm{Cd} \text { in dry ether → }
$$
S $$
\mathrm{RCHO}
$$
A

$$ W-Q \quad X-P \quad Y-S \quad Z-R $$

B

$$ W-R \quad X-P \quad Y-Q \quad Z-S $$

C

$$ W-R \quad X-S \quad Y-P \quad Z-Q $$

D

$$ W-S \quad X-R \quad Y-Q \quad Z-P $$