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Free download in PDF Organic Chemistry Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>
(1)
Which types of isomers are formed in rearrangement reactions?
[A]
structural isomers
[B]
Geometrical isomers
[C]
Optical isomer
[D]
Conformational isomers
Answer: structural isomers
(2)
What is the main difference between Hofmann and Curtius rearrangement?
[A]
Products are different
[B]
Intermediate formed is different
[C]
Reactants are different
[D]
Isomers
Answer: Reactants are different
(3)
With accompanying 1, 2-rearrangement in wolff rearrangement, an α-diazocarbonyl compound is converted into a ketene by loss of which of the following compound?
[A]
Dioxygen
[B]
Dinitrogen
[C]
Disulphur
[D]
Ammonia
(4)
Which Intermediate is formed in Wolff’s reaction?
[A]
Carbene
[B]
Ketene
[C]
Carbocation
[D]
Carbanion
(5)
Which was the first molecular rearrangement identified as such by early chemists?
[A]
Wolff’s rearrangement
[B]
Pinacole rearrangement
[C]
Favorskii rearrangement
[D]
Hofmann rearrangement
Answer: Pinacole rearrangement
(6)
Which intermediate carbocation is more stable in pinacole -pinacolone rearrangement?
[A]
1°
[B]
2°
[C]
3°
[D]
4°
(7)
In which medium Favorskii rearrangement occurs?
[A]
Acidic
[B]
Basic
[C]
Neutral
[D]
Alkaline
(8)
The benzylic acid rearrangement reaction of a cyclic diketone leads to _______
[A]
Ring expansion
[B]
Ring contraction
[C]
Ring fusion
[D]
Isomers
(9)
Which medium is used in benzylic acid rearrangement reaction?
[A]
Neutral
[B]
Strong basic
[C]
Mild acidic
[D]
Strong acidic
(10)
Which type of catalytic reaction, does Dienone phenol rearrangement reaction belong?
[A]
Acid catalysed
[B]
Base catalysed
[C]
Acidic
[D]
Neutral
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