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

Identify the product $$[\mathrm{C}]$$ formed at the end of the reaction below

1,1,2,2- Tetrabromopropane + 2 $$\mathrm{Zn}_{(\mathrm{S})}$$ / Ethanol $$\rightarrow$$ [B]

$$[\mathrm{B}]$$ + 2 moles of $$\mathrm{HBr} \rightarrow[\mathrm{C}]$$

A
2, 2-Dibromopropane
B
1, 1- Dibromopropane
C
1,3-Dibromopropane
D
1, 2-Dibromopropane
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Given below are 4 reactions. Two of these reactions will give product which is an equimolar mixture of the d and 1 forms. Identify these 2 reactions.

[A] 2- Methylpropene + $$\mathrm{HI} \rightarrow$$ ---------

[B] But-1-ene + $$\mathrm{HBr} \rightarrow$$ -----------

[C] 3-Methylbut-1-ene + $$\mathrm{HI} \rightarrow$$ -----------

[D] 3- Phenylpropene + $$\mathrm{HBr}$$ (Peroxide) $$\rightarrow$$ -----------

A
C & A
B
D & B
C
B & C
D
A & D
3
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Ammoniacal silver nitrate forms a white precipitate easily with

A
$$\mathrm{CH}_3 \mathrm{C}=\mathrm{CH}$$
B
$$\mathrm{CH}_3 \mathrm{C}=\mathrm{CCH}_3$$
C
$$\mathrm{CH}_3 \mathrm{CH}=\mathrm{CH}_2$$
D
$$\mathrm{CH}_2=\mathrm{CH}_2$$
4
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The conversion of Propyne to Benzene can be brought out in 4 steps.

Choose the reagents to be used, in the proper sequential order, to bring out the conversion.

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. $$\mathrm{H}_2 \mathrm{SO}_4$$

A
$$\mathrm{Na} /$$ Ether, $$\mathrm{Cr}_2 \mathrm{O}_3$$ (high $$\mathrm{T}$$ and $$\mathrm{P}$$), $$\mathrm{HBr}, \mathrm{H}_2 / \mathrm{Pd}$$
B
$$\mathrm{HBr}$$, 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 $$\mathrm{P}$$)
C
$$\mathrm{Cr}_2 \mathrm{O}_3$$ (high $$\mathrm{T}$$ and $$\mathrm{P}$$), $$\mathrm{Na} /$$ dry ether, $$\mathrm{HBr}$$, Conc. $$\mathrm{H}_2 \mathrm{SO}_4$$
D
$$\mathrm{H}_2 / \mathrm{Pd}, \mathrm{HBr} /\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{CO}\right)_2 \mathrm{O}_2, \mathrm{Na} /$$ dry ether, $$\mathrm{Cr}_2 \mathrm{O}_3$$ (high $$\mathrm{T}$$ and $$\mathrm{P}$$)
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