MCAT Chemical and Physical Foundations of Biological Systems Practice Exam 2025 - Free MCAT Practice Questions and Study Guide

Question: 1 / 400

In the context of imines and enamines, which atoms are involved in the double bond of an imine?

C and O

C and N

An imine is a functional group characterized by a carbon-to-nitrogen double bond (C=N). In the structure of an imine, the carbon atom is typically part of a carbonyl (C=O) group that has been converted into an imine through a reaction with an amine. When this reaction occurs, the oxygen atom is replaced by a nitrogen atom from the amine, resulting in a double bond between the carbon atom of the carbonyl group and the nitrogen atom of the amine.

Therefore, in the context of the double bond within an imine, the bond is formed specifically between the carbon and the nitrogen. This highlights the essential nature of the imine functional group, which plays a significant role in various biological processes and synthetic organic chemistry.

The other options do not accurately describe the bonding in an imine. C and O denotes a carbonyl group, which is not relevant here, while N and H pertains to the amine, and C and C refers to a carbon-to-carbon bond, which is not a component of imines. Thus, the double bond in an imine distinctly involves the carbon and nitrogen atoms.

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N and H

C and C

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