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

The hybridisation of atomic orbitals of nitrogen in $\mathrm{NO}_2{ }^{+}, \mathrm{NO}_3{ }^{-}$and $\mathrm{NH}_4{ }^{+}$are respectively

A

$s p, s p^2, s p^3$

B

$s p, s p^3, s p^2$

C

$s p^2, s p^2, s p^3$

D

$s p^2, s p, s p^3$

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

An aliphatic compound $[\mathrm{X}]$, Molecular formula $\left(\mathrm{C}_4 \mathrm{H}_{10} \mathrm{O}\right)$ can be prepared from Acetone and $\mathrm{R}-\mathrm{Mg}-\mathrm{X}$.

$[\mathrm{X}]$ with $20 \%$ Phosphoric acid gives an unsaturated compound $\mathrm{C}_4 \mathrm{H}_8[\mathrm{Y}]$. Compound $[\mathrm{Y}]$ is also obtained on heating $[\mathrm{X}]$ with Copper metal at 573 K . $[\mathrm{X}]$ shows no reaction with PCC but on heating with acidified $\mathrm{KMnO}_4$ it forms Acetone $+\mathrm{CO}_2+\mathrm{H}_2 \mathrm{O}$.

Compounds $[\mathrm{X}]$ and $[\mathrm{Y}]$ are $\_\_\_\_$ and $\_\_\_\_$

A

[X]: Butan-2-ol      [Y]: But-2-ene

B

[X]: 2-Methylpropan-1-ol    [Y]: But-1-ene

C

[X]: 2-Methylpropan-2-ol   [Y]: 2-Methylpropene

D

[X]: Butan-1-ol    [Y]: But-1-ene

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

Rate law can be determined from a balanced chemical equation if

A

one of the reactants is in excess

B

there is a sequence of elementary reactions

C

it is a reversible reaction

D

it is an elementary reaction

4
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