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

What is the percentage dissociation of 0.8 ml of Acetic acid (density is $1.04 \mathrm{~g} / \mathrm{ml}$ ) which is dissolved in 1.2 L of water if the observed Depression in freezing point is 0.0228 K ? ( $\mathrm{K}_{\mathrm{f}}$ for water $=1.86 \mathrm{Kkg} / \mathrm{mol}$.)

A

6

B

9

C

12

D

10

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

A compound with molecular formula $\mathrm{C}_5 \mathrm{H}_{10}$ that gives acetone on ozonolysis is:

A

2-methyl-2-butene

B

2-methyl-1-butene

C

3-methyl-1-butene

D

Cyclopentane

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

Consider the gaseous equilibrium

$2 \mathrm{AB}_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{AB}_{(\mathrm{g})}+\mathrm{B}_{2(\mathrm{~g})}$

The expression relating the degree of dissociation ( $\alpha$ ) and equilibrium constant ( $K_p$ ) and total pressure $P$ is:

A

$\left(\frac{2 K_p}{P}\right)^2$

B

$\left(\frac{K_p}{2 P}\right)^{1 / 2}$

C

$\left(\frac{K_p}{2 P}\right)^{1 / 3}$

D

$\left(\frac{2 K_p}{P}\right)^{1 / 3}$

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

Which one of the following statements is wrong?

A

Anisole reacts with Ethanoyl chloride / anhydrous $\mathrm{AlCl}_3$ in $\mathrm{CS}_2$ to form 4-Methoxyacetophenone in larger amount

B

Isopropyl methyl ether reacts with Conc. HI to produce isopropyl alcohol and methyl iodide by $\mathrm{S}_{\mathrm{N}} 2$ mechanism

C

Tert. butyl methyl ether reacts with Conc. HI on heating to form 2-lodo-2-methylpropane and Methanol by $\mathrm{S}_{\mathrm{N}} 1$ mechanism

D

Anisole is prepared by reaction between Bromobenzene and Sodium methoxide