PRELAB EXERCISE EXPERIMENT 15 Reactions of Aldehydes and Ketones 1. Why are alde

Question

PRELAB EXERCISE EXPERIMENT 15 Reactions of Aldehydes and Ketones 1. Why are aldehydes more reactive towards nucleophiles than ketones? 2 It is not advisable to prepare and store Tollens' reagent in advance for tests described in this experiment. Why? 3 and semicarbazones all a family of compounds known as imines. What structural feature in these compo makes this general 4 Why does the nitrogen atom of the NH, (and not the nitrogen atom ofthe NH) group of phenylhydrazine act as the nucleophilie site in the formation of phenylhydrazones? pollicly websne in whole or in 245

Explanation / Answer

Question 1.

Aldehydes have a terminal group whichi s C=O C-H

thereofre, the C-H bond is easily subtituted by nucloephiles

C=O electrons are nearest to the terminal point

By the other hand

Ketones are much mores stable

R-C=O- R group will not allow to treact the Carbonyl gruop (C=O)

therefore, the aldehyde will react faster/easier with a nucelophile

Recall that nucelophile is the species that will strip protons such as H+

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