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1
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Arrange the following compounds in the decreasing order of reactivity towards electrophilic substitution reaction.

(I) Chlorobenzene

(II) Nitrobenzene

(III) Benzene

(IV) Isopropylbenzene

A
$$ \text { IV }>\text { III }>\text { I }>\text { II } $$
B
$$ \mathrm{I}>\mathrm{II}>\mathrm{IV}>\mathrm{III} $$
C
$$ \mathrm{IV}>\mathrm{I}>\mathrm{II}>\mathrm{III} $$
D
$$ \mathrm{III}>\mathrm{II}>\mathrm{IV}>\mathrm{I} $$
2
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Arrange the following in the order of increasing reactivity towards $$\mathrm{SN}_{\mathrm{2}}$$ reactions.

$$\begin{array}{ll} \left(\mathrm{CH}_3\right)_3 \mathrm{CCH}_2 \mathrm{Br}(\mathrm{P}) ; & \\\mathrm{CH}_3\left(\mathrm{CH}_2\right)_3 \mathrm{Br}(\mathrm{Q}) ; &\\ \mathrm{CH}_3 \mathrm{CH}_2-\mathrm{CH}\left(\mathrm{CH}_3\right)-\mathrm{CH}_2 \mathrm{Br}(\mathrm{R}) ; & \\\left(\mathrm{CH}_3\right)_2 \mathrm{CHCH}_2 \mathrm{CH}_2 \mathrm{Br}(\mathrm{S}) \end{array}$$

A
$$ \mathrm{R}<\mathrm{P}<\mathrm{Q}<\mathrm{S} $$
B
$$ \mathrm{P}<\mathrm{Q}<\mathrm{R}<\mathrm{S} $$
C
$$ \mathrm{P}<\mathrm{R}<\mathrm{S}<\mathrm{Q} $$
D
$$ \mathrm{Q}<\mathrm{S}<\mathrm{R}<\mathrm{P} $$
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Choose the incorrect statement from the following.

A
Carbon tetrachloride is used as a preservative for anatomical specimens
B
Freon-12 acts as a propellant in aerosol sprays
C
Dichloromethane is used as a solvent in drug industry
D
DDT is useful to protect crops and to kill mosquitoes that spread malaria
4
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Consider the following reaction

$$(\mathrm{CH}_3)_2 \mathrm{CHCH}_2 \mathrm{Br}+(\mathrm{CH}_3)_3 \mathrm{CCH}_2 \mathrm{Br} \xrightarrow[\Delta]{\mathrm{Na} \text { /dry ether }} \mathrm{X}+\mathrm{Y}+\mathrm{Z}$$

Identify the product which is not formed?

A
2, 2, 5-trimethylhexane
B
2, 2, 4, 4-tetramethylhexane
C
2, 2, 5, 5-tetramethylhexane
D
2, 5-dimethylhexane
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