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How can you identify ketones?

Answer 1

Emilia Alvarez

Ketones are the ones with the functional group : #R-(C=0)-R_1# where R and #R_1# are any other groups.

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Answer 2

Sarah Angotti

Ketones can be identified through various chemical tests, including:

Using 2,4-Dinitrophenylhydrazine (2,4-DNPH) test: Ketones react with 2,4-DNPH to form a yellow or orange precipitate.
Tollens' Test: Ketones can be distinguished from aldehydes using Tollens' reagent, which forms a silver mirror on the inner surface of the test tube when a ketone is present.
Iodoform Test: Ketones react with iodine and sodium hydroxide to form a yellow precipitate of iodoform.
NMR Spectroscopy: Ketones exhibit specific peaks in the NMR spectrum, typically around 2.1-2.5 ppm for the carbonyl carbon and around 1.0-2.0 ppm for the adjacent carbon atoms.

These methods help in the identification of ketones based on their chemical properties and reactions.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.