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1
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Identify the reagents $$\mathrm{X}, \mathrm{Y}$$ and $$\mathrm{Z}$$ used to bring out the following reactions.

COMEDK 2023 Evening Shift Chemistry - Hydrocarbons Question 1 English

A
$$ \mathrm{X}=\text { Alkaline } \mathrm{KMnO}_4 \quad \mathrm{Y}=\text { dil } \mathrm{HCl} \quad \mathrm{Z}=\mathrm{CrO}_3 $$
B
$$ \mathrm{X}=\text { Air } \quad \mathrm{Y}=\text { dil. } \mathrm{H}_2 \mathrm{SO}_4 \quad \mathrm{Z}=\mathrm{Cr}_2 \mathrm{O}_7{ }^{2-} / \mathrm{H}^{+} $$
C
$$ \mathrm{X}=\mathrm{H}_2 \mathrm{O}_2 \quad \mathrm{Y}=\text { Conc. } \mathrm{HCl} \quad \mathrm{Z}=\mathrm{O}_3 $$
D
$$ \mathrm{X}=\text { DIBAL- } \mathrm{H} \quad \mathrm{Y}=\text { Conc. } \mathrm{HNO}_3 \quad \mathrm{Z}=\mathrm{CrO}_2 \mathrm{Cl}_2 $$
2
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

What can be A and B in the following reaction?

COMEDK 2022 Chemistry - Hydrocarbons Question 5 English

A
A B
$$\mathrm{HBr}$$ $$\mathrm{alc. ~KOH}$$
B
A B
$$\mathrm{HBr,Peroxide}$$ $$\mathrm{alc. ~KOH}$$
C
A B
$$\mathrm{HBr,Peroxide}$$ $$\mathrm{aq. ~KOH,\Delta}$$
D
A B
$$\mathrm{HBr}$$ $$\mathrm{aq. ~KOH,\Delta}$$
3
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

Which of the product is not possible in Wurtz reaction?

A
Methane
B
Ethane
C
Propane
D
Butane
4
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

Coupling reaction is an example of

A
nucleophilic addition reaction.
B
nucleophilic substitution reaction.
C
electrophilic substitution reaction.
D
electrophilic addition reaction.
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