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

Which one of the following is the correct order of reagents to be used to convent [A] to [X] ?

COMEDK 2024 Evening Shift Chemistry - Aldehyde and Ketone Question 1 English

$$ \text { Reagents: } \mathrm{PCC}, \mathrm{PCl}_5, \mathrm{LiAlH}_4, \frac{\mathrm{KCN}}{\mathrm{H}_3 \mathrm{O}^{+}} $$

A
$$ \frac{K C N}{H_3 \mathrm{O}^{+}} \quad \mathrm{PCl}_5 \quad \mathrm{PCC} \quad \mathrm{LiAlH}_4 $$
B
$$ \mathrm{PCl}_5, \quad \frac{K C N}{H_3 \mathrm{O}^{+}} \quad \mathrm{LiAlH}_4 \quad \mathrm{PCC} $$
C
$$ \mathrm{LiAlH}_4, \frac{K C N}{H_3 \mathrm{O}^{+}} \quad \mathrm{PCl}_5 \quad \mathrm{PCC} $$
D
$$ \mathrm{PCC} \quad \mathrm{PCl}_5 \quad \frac{K C N}{\mathrm{H}_3 \mathrm{O}^{+}} \quad \mathrm{LiAlH}_4 $$
2
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$\text { Identify }[\mathrm{B}] \text { and }[\mathrm{C}] \text { formed in the reactions given below. }$$

COMEDK 2024 Morning Shift Chemistry - Aldehyde and Ketone Question 5 English

A
[B] Propene [C] Propanal
B
[B] Cyclopropane [C] Ethanal
C
[B] Propane [C] Ethanol
D
[B] Propyne [C] Propanone
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which one of the following statements is incorrect regarding acetal and ketal formation when Propanal and Propanone are separately reacted with Ethanol in presence of anhydrous $$\mathrm{HCl}$$ gas.

A
Anhydrous $$\mathrm{HCl}$$ gas decreases the electrophilicity of the Carbonyl Carbon.
B
Rate of formation of acetal is greater than that of ketal formation.
C
Propanal and Ethanol should be taken in the approximate ratio of $$1: 2$$ for acetal formation.
D
Both Propanal and Propanone undergo Nucleophilic addition reaction during this process.
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A Carbonyl compound $$\mathrm{X}$$ when reacted with Methyl magnesium bromide followed by hydrolysis gave product $$\mathrm{Y}$$. When $$\mathrm{Y}$$ is heated with $$\mathrm{Cu}$$ at $$573 \mathrm{~K}$$, it gave $$\mathrm{Z}$$ (2- Methylbut-2-ene) as one of the products. Identify $$\mathrm{X}$$.

A
Pentan-2-one
B
Butanal
C
Butanone
D
Pentan-3-one
COMEDK Subjects
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
CBSE
Class 12