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

Two statements, Assertion and Reason are given. Choose the correct option from the following.

Assertion: In the secondary structure of RNA, double helix structure is formed.

Reason: In the double structure of RNA, two nucleic acid chains are wound about each other and held together by hydrogen bonds between pairs of bases

A
Assertion is correct but Reason is incorrect.
B
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
C
Assertion is incorrect but Reason is correct.
D
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

An inorganic compound $$\mathrm{W}$$ undergoes the following reactions:

$$ \begin{gathered} W+\frac{\mathrm{Na}_2 \mathrm{CO}_3}{\mathrm{O}_2 / \text { heat }} \rightarrow X+\frac{\mathrm{H}^{+}}{} \rightarrow Y_{(s)} \\ Y(a q)+\mathrm{KCl}(\mathrm{aq}) \rightarrow Z_{(S)} \end{gathered} $$

Z appears in the form of orange crystals and is used as an oxidising agent in acid medium. Identify the compound W.

A
$$\mathrm{K}_2 \mathrm{CrO}_4$$
B
$$\mathrm{FeCr}_2 \mathrm{O}_4$$
C
$$\mathrm{Cu}(\mathrm{CrO}_2)_2$$
D
$$\mathrm{Na}_2 \mathrm{CrO}_4$$
3
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Given are the names of 4 compounds. Two of these compounds will not undergo Cannizzaro's reaction. Identify the two.

A. 2-Chlorobutanal

B. 2,2-Dimethylpropanal

C. Benzaldehyde

D. 2-Phenyl ethanol

A
A & D
B
D & C
C
C & B
D
A & B
4
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
EXAM MAP