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Positional Isomerism

Which pair be...

Question

Which pair below represents isomers ?

C H_{3} C H_{2} C H_{2} O H

and

H O C H_{2} C H_{2} C H_{2} C H_{3}

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C H_{3} C H_{2} C H_{3}

and

C H_{3} C H_{2} C H_{2} C H_{3}

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C H_{3} C H (C l) C H_{3}

and

C H_{3} C H_{2} C H_{2} C l

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C H_{3} C O C H_{3}

and

C H_{3} C H_{2} C H_{2} C H O

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Solution

The correct option is C $C H_{3} C H (C l) C H_{3}$ and $C H_{3} C H_{2} C H_{2} C l$
Isomers are the compounds having same molecular formula but different properties due to difference in arrangement of atoms. $C H_{3} C H C l C H_{3}$ and $C H_{3} C H_{2} C l$ both have same molecular formula $C_{3} H_{7} C l$ Thus they are positional isomers.
In all other options, the molecular formula of the two cmpounds are not same. So, the correct answer is option (c).

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