Organic Chemistry Multiple Choice Questions and Answers – Rearrangement Reactions

Questions
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

Answer: Dinitrogen
4 Which Intermediate is formed in Wolff’s reaction?
A Carbene
B Ketene
C Carbocation
D Carbanion

Answer: Ketene
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°

Answer: 3°
7 In which medium Favorskii rearrangement occurs?
A Acidic
B Basic
C Neutral
D Alkaline

Answer: Basic
8 The benzylic acid rearrangement reaction of a cyclic diketone leads to _______
A Ring expansion
B Ring contraction
C Ring fusion
D Isomers

Answer: Ring contraction
9 Which medium is used in benzylic acid rearrangement reaction?
A Neutral
B Strong basic
C Mild acidic
D Strong acidic

Answer: Strong basic
10 Which type of catalytic reaction, does Dienone phenol rearrangement reaction belong?
A Acid catalysed
B Base catalysed
C Acidic
D Neutral

Answer: Acid catalysed
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