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Write a test to differentiate between

Question:

Write a test to differentiate between pentan-2-one and pentan-3-one.

Solution:

One can differentiate between pentan-2-one and pentan-3-one by iodoform test. Pentan-2-one have a –CO-CH3 group and therefore forms a yellow precipitate of

Iodoform. Pentan-2-one gives a positive iodoform test, whereas, and pentan-3-one does not give a positive iodoform test because they don’t have a –CO-CH3 group.

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