name an isomer of pentane (that is not cyclic)and write down its structure
C-C-C-C-C with all bonds filled with H is n-pentane.
C
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C-C
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C
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C
with all the bonds filled with H is 2-pentane or isopentane. (There is a third one; i.e., neopentane, in which the lowest C on the second structure is attached to the #2 carbon--the same one to which the other CH3 is attached.)
I didn't name the isopentane (which is correct) correctly. It should be called 2-methyl butane.
An isomer of pentane that is not cyclic is 2-methylbutane. To understand its structure, let's break it down step by step:
1. Start with the base structure of pentane, which consists of five carbon atoms in a straight line with each carbon bonded to two hydrogen atoms. The molecular formula for pentane is C5H12.
2. Add a methyl (CH3) group to the second carbon atom of pentane. This means replacing one of the hydrogen atoms on the second carbon with a methyl group.
The resulting structure is:
CH3 - CH - CH2 - CH2 - CH3
This is 2-methylbutane, an isomer of pentane.