Question

Which shows an isomer of the molecule below?

Answer 1

Above question is incomplete. Complete question is attached below
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Correct Answer: Option D i.e. CH3CH2CH2CH2CH3

Reason:
Isomers are the compounds having same molecular formula, but different structural formula.

The molecular formula of the compound is C5H12

The compound present is question (i.e. 2-methyl butane) and option D (n-pentane) has same molecular formula. Hence, they are isomers.

However, compound present in option A, is the same compound provided in question. Hence, it is not an isomer. Compounds reported in option B and C has one carbon atom less and more, respectively as compared to the compound reported in question. Hence, they are also not isomers. 

Answer 2

The isomer of 2-methyl butane present in given options is CH₃CH₂CH₂CH₂CH₃, as they have same number of carbon and hydrogen atoms.

What are isomers?

Isomers are those molecules which have same molecular formula but have different structural formula.

In the question given compound is 2-methyl butane means methyl group is present on the second position of the butane ad molecular formula of this compound is C₅H₁₂ (according to attached pic).

According to the question:

• Options A, B and C are not isomers as in their molecular formula number of carbon atoms are not equal to that present in the 2-methyl butane.
• Option D is an isomer of given compound because number of carbon atoms as well as of hydogen atoms are equal in  2-methyl butane and CH₃CH₂CH₂CH₂CH₃.

So isomer of given compound is CH₃CH₂CH₂CH₂CH₃.

To know more about isomers, visit the below link:
https://brainly.com/question/15183293