Which of the following compounds is a structural (constitutional) isomer of 2-methylbutane?A) pentaneB) butaneC) penteneD) cyclopentaneE) cyclobutane
Question
Which of the following compounds is a structural (constitutional) isomer of 2-methylbutane?A) pentaneB) butaneC) penteneD) cyclopentaneE) cyclobutane
Solution
The structural (constitutional) isomer of 2-methylbutane is pentane.
Here's why:
Structural isomers are compounds that have the same molecular formula but different physical structures.
2-methylbutane has the molecular formula C5H12.
Looking at the options:
A) Pentane also has the molecular formula C5H12, but a different structure, making it a structural isomer of 2-methylbutane.
B) Butane has the molecular formula C4H10, so it's not an isomer of 2-methylbutane.
C) Pentene has the molecular formula C5H10, so it's not an isomer of 2-methylbutane.
D) Cyclopentane has the molecular formula C5H10, so it's not an isomer of 2-methylbutane.
E) Cyclobutane has the molecular formula C4H8, so it's not an isomer of 2-methylbutane.
So, the correct answer is A) Pentane.
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