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Question

How many structure isomers can you draw for pentane?

A
2
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B
3
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C
4
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D
5
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Solution

The correct option is B 3
Pentane (C5H12) is an organic compound and an alkane with five carbon atoms. Pentane has three structural isomers. These are n-pentane, Iso-pentane and neo-pentane.
Pentane means exclusively the n-pentane isomer; the other two being called isopentane (methylbutane) and neopentane (dimethylpropane). Cyclopentane is not an isomer of pentane.
Structures of all the three isomers are given here.
Option B is correct.

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