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Question

Which of the following is position and chain isomer of

:


A

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B

CH3 - CH2- CH2- CH2- CHO

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C

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D

CH3 - CH2- C - CH2 - CH3

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Solution

The correct options are
A


C


We know about chain and position isomers.

First check the molecular formula:

CH3CH2O||CCH2CH3

C5H10O

Option (a) C5H10O

Option (b) C5H10O

Option (c) C5H10O

Option (d) C5H10O

So,molecular formula of all the structures is same.

To be a position and chain isomer ,it should follow the conditions of both.

Option (b) has a different functional group(-CHO). Therefore, it is neither position nor chain isomers.

Option (d) is a position isomer but not chain isomer.

If you look at option (a) and (c) closely,they both are same.

CH3O||CCH3|CHCH3

CH3O||CCH|CH3CH3

3-Methybutan-2-one 3-Methylbutan-2-one

It follows conditions for both position and chain isomerism.

Therefore,

Option (a) and (c) both are correct.


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