Case Study Question 01

Science

Chapter 4: Carbon and its Compounds

Class 10

Read the following passage carefully and answer the following questions:
The compounds which have the same molecular formula but differ from each other in physical or chemical properties are called isomers and this phenomenon is known as isomerism. Structural isomerism is when isomers have difference in the arrangement of atoms within the molecule, without any reference to space. We can say that compounds which have the same molecular formula but different structural formula show structural isomerism. Compounds of carbon show this phenomenon as the atoms can be linked together in the form of straight chains, branched chains or even rings.

Question.1.
Among the following sets of compounds, choose the set having thesame molecular formulae:

(a) Butane and iso-butane
(b) Cyclohexane and hexene
(b) Propanal and propanone
(d) All

(d) All

Question.2.
The minimum number of carbon atoms required in an organic compound, in order to form branching:

(a) 3
(b) 4
(b) 5
(d) 2

(b) 4

Question.3.
Which of the following pairs show isomerism?

(a) Ethane and ethene
(b) Propane and butane
(b) Ethane and propane
(d) Butane and 2-methyl propane

(d) Butane and 2-methyl propane

Question.4.
Which among the following has the longest chain?

(a) Iso-pentane
(b) 2-methylpentane
(c) 2,2-dimethylbutane
(d) neopentane

(b) 2-methylpentane

Question.5.
The number of isomers of pentane is:

(a) 4
(b) 3
(c) 2
(d) 5

(b) 3

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