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

Arrange the given alkanes in increasing order of their boiling points.

(A) 2, 2-dimethylpropane

(B) 2-methylbutane

(C) n-pentane

(D) n-butane

A

$D< A< B< C$

B

$C< A< B< D$

C

$D< C< B< A$

D

$A< B< C< D$

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

Which of the following does not correctly represent the order of the property indicated against it?

A

$T i< V< C r< M n$ [Increasing order of melting point]

B

$\mathrm{Ti}^{3+}<\mathrm{V}^{3+}<\mathrm{Cr}^{3+}<\mathrm{Mn}^{3+}$ [Increasing order of magnetic moment]

C

$T i< V< M n< C r$ [Increasing order of second ionisation enthalpy]

D

$T i< V< C r< M n$ [Increasing order of highest oxidation state]

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

According to Molecular orbital theory, which of the following is correct with respect to bond order?

A

Bond order of $\mathrm{N}_2^{+}$is less than $\mathrm{O}_2$ while that of $\mathrm{O}_2^{+}$is more than $\mathrm{O}_2$.

B

Bond order of $\mathrm{N}_2^{+}$is less than $\mathrm{N}_2$ while that of $\mathrm{O}_2^{+}$is more than $\mathrm{O}_2$.

C

Bond order of $\mathrm{N}_2^{+}$and $\mathrm{O}_2^{+}$is less than $\mathrm{O}_2$

D

Bond order of $\mathrm{N}_2^{+}$and $\mathrm{O}_2^{+}$is more than $\mathrm{N}_2$

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

$$ \text { Match the characteristic from Col. I with the Vitamins given in Col. II. } $$

$$
\text { Characteristics }
$$
$$
\text { Vitamins }
$$
A Water soluble that is not excreted easily W $$
\mathrm{B}_2
$$
B Prevents Cheilosis X $$
\mathrm{B}_6
$$
C Fat soluble Y $$
\mathrm{B}_12
$$
D Prevents seizures and convulsions Z E
A

$$ \begin{array}{llll} A-X & B-Z & C-W & D-Y \end{array} $$

B

$$ \begin{array}{llll} A-Z & B-Y & C-X & D-W \end{array} $$

C

$$ \begin{array}{llll} A-X & B-Y & C-Z & D-W \end{array} $$

D

$$ \begin{array}{llll} A-Y & B-W & C-Z & D-X \end{array} $$