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Question
Why is Butan-1-ol optically inactive but Butan-2-ol is optically active?
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Solution
Butan-2-ol has a chiral centre, that is, butan-2-ol has a carbon atom bonded to four different substituents.

Thus, it is optically active. On the other hand, butan-1-ol does not have any chiral carbon atoms.

Therefore, it is optically inactive.
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