Organic Chemistry Multiple Choice Questions and Answers – Isomerism

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Questions
1 Choose the incorrect option regarding Isomerism.
A They differ in both physical and chemical properties
B They have the different molecular formula
C There are two types of Isomerism : Structural and Stereo Isomerism
D Geometric and optical isomerism are two types of Stereo Isomerism

Answer: They have the different molecular formula
2 Isomerism that arises out of the difference in spatial arrangement of atoms or groups about the doubly bonded carbon atoms are called? (In specific)
A Structural Isomerism
B Stereo Isomerism
C Geometrical Isomerism
D Optical Isomerism

Answer: Geometrical Isomerism
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3 Isomers with similar groups on the same side are called as ” trans” isomers.
A True
B False

Answer: False
4 Which among the following defines Meso forms of isomers?
A Meso form is optically inactive due to external compensation
B The molecules of the meso isomers are chiral
C It can be separated into optically active enantiometric pairs
D It is a single compound

Answer: It is a single compound
5 Which among the following does not exhibit geometric isomerism?
A 1-hexene
B 2-hexene
C 3-hexene
D 4-hexene

Answer: 1-hexene
6 Which among the following is formed when an alcohol is dehydrated?
A alkane
B alkyne
C alkene
D aldehyde

Answer: alkene
7 A fat on hydrolysis would yield?
A Glycerol and soap
B Ethanol and soap
C Ethanol and glycerol
D Only soap

Answer: Glycerol and soap
8 Which among the following correctly defines Diastereomer?
A These have same magnitude but different signs of optical rotation
B Nonsuperimposable object mirror relationship
C These differ in all physical properties
D Separation is very difficult

Answer: These differ in all physical properties
9 The molecular formula C5H12 contains how many isomeric alkanes?
A 1
B 2
C 3
D 4

Answer: 3
10 Identify the chiral molecule among the following.
A Isopropyl alcohol
B 2-pentanol
C 1-bromo 3-butene
D Isobutyl alcohol

Answer: Isobutyl alcohol

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