Which of the following contains carbonyl group ?

a) Ketones b) Aldehydes c) Esters d) All of these

Carbon directly attached to oxygen with a double bond is said to be carbonyl group. As aldehyde, ketones, carboxylic acids, ester, acid halides, acid anhydrides all comprise of a carbonyl group therefore the correct option is D. i.e. all of them. 

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d) all of these

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