COMEDK 2023 Morning Shift | Hydrocarbons Question 1 | Chemistry

Reagents provided: alc. $$\mathrm{KOH}, \mathrm{H}_2 / \mathrm{Pd}, \mathrm{Na} /$$ dry ether, $$\mathrm{HBr}, \mathrm{HBr} /\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{CO}\right)_2 \mathrm{O}_2$$, Soda-lime, $$\mathrm{Cr}_2 \mathrm{O}_3$$ (high T and P), Conc. $$\mathrm{H}_2 \mathrm{SO}_4$$

$$\mathrm{Na} /$$ Ether, $$\mathrm{Cr}_2 \mathrm{O}_3$$ (high $$\mathrm{T}$$ and $$\mathrm{P}$$), $$\mathrm{HBr}, \mathrm{H}_2 / \mathrm{Pd}$$

$$\mathrm{HBr}$$, alc. $$\mathrm{KOH}, \mathrm{HBr} /\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{CO}\right)_2 \mathrm{O}_2, \mathrm{Cr}_2 \mathrm{O}_3$$ (high $$\mathrm{T}$$ and $$\mathrm{P}$$)

$$\mathrm{Cr}_2 \mathrm{O}_3$$ (high $$\mathrm{T}$$ and $$\mathrm{P}$$), $$\mathrm{Na} /$$ dry ether, $$\mathrm{HBr}$$, Conc. $$\mathrm{H}_2 \mathrm{SO}_4$$

$$\mathrm{H}_2 / \mathrm{Pd}, \mathrm{HBr} /\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{CO}\right)_2 \mathrm{O}_2, \mathrm{Na} /$$ dry ether, $$\mathrm{Cr}_2 \mathrm{O}_3$$ (high $$\mathrm{T}$$ and $$\mathrm{P}$$)

COMEDK 2023 Evening Shift

MCQ (Single Correct Answer)

-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

$$ \mathrm{X}=\text { Alkaline } \mathrm{KMnO}_4 \quad \mathrm{Y}=\text { dil } \mathrm{HCl} \quad \mathrm{Z}=\mathrm{CrO}_3 $$

$$ \mathrm{X}=\text { Air } \quad \mathrm{Y}=\text { dil. } \mathrm{H}_2 \mathrm{SO}_4 \quad \mathrm{Z}=\mathrm{Cr}_2 \mathrm{O}_7{ }^{2-} / \mathrm{H}^{+} $$

$$ \mathrm{X}=\mathrm{H}_2 \mathrm{O}_2 \quad \mathrm{Y}=\text { Conc. } \mathrm{HCl} \quad \mathrm{Z}=\mathrm{O}_3 $$

$$ \mathrm{X}=\text { DIBAL- } \mathrm{H} \quad \mathrm{Y}=\text { Conc. } \mathrm{HNO}_3 \quad \mathrm{Z}=\mathrm{CrO}_2 \mathrm{Cl}_2 $$

COMEDK 2022

MCQ (Single Correct Answer)

-0

What can be A and B in the following reaction?

COMEDK 2022 Chemistry - Hydrocarbons Question 5 English

A	B
$$\mathrm{HBr}$$	$$\mathrm{alc. ~KOH}$$

A	B
$$\mathrm{HBr,Peroxide}$$	$$\mathrm{alc. ~KOH}$$

A	B
$$\mathrm{HBr,Peroxide}$$	$$\mathrm{aq. ~KOH,\Delta}$$

A	B
$$\mathrm{HBr}$$	$$\mathrm{aq. ~KOH,\Delta}$$

COMEDK Subjects