The reaction of aldehydes and ketones with ammonia derivative G-NH2 to form compounds containing the group \c=N-G and water is known as_.
Correct answer: D. Addition-elimination
- A. Nucleophilic addition
- B. Nucleophilic substitution
- C. Electrophilic addition
- D. Addition-elimination
Explanation
Option D is correct.Yes, the reaction of aldehydes and ketones with ammonia derivatives is known as addition-elimination. This reaction is a two-step process. Step 1 The ammonia derivative (G-NH2) adds to the carbonyl group of the aldehyde or ketone to form an imine. The imine is a compound that contains a carbon-nitrogen double bond and a hydrogen atom on the nitrogen atom. The following reaction takes place in the first step: RCHO + G-NH2 → RC=N-G + H2O Here, RCHO represents the aldehyde or ketone, and G represents the group attached to the nitrogen atom of the ammonia derivative. Step 2 The imine is then hydrolyzed to form a new compound containing the group \c=N-G and water. The hydrolysis reaction is catalyzed by a base, such as sodium hydroxide (NaOH). The following reaction takes place in the second step: RC=N-G + H2O → RC=N-G + H2O The addition-elimination reaction is a versatile reaction that can be used to synthesize a variety of compounds. For example, it can be used to synthesize Schiff bases, which are important in organic chemistry and biochemistry.
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About Aldehydes and Ketones
Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.
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