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Sagot :
To determine which of the given options represents an aldehyde, we need to understand the structure of an aldehyde functional group. An aldehyde has the general formula R-CHO, where "R" represents an alkyl or aryl group, and "CHO" signifies a carbonyl group (C=O) with a hydrogen atom bonded to the carbonyl carbon.
Now let's analyze each given option:
1. [tex]\( R - O \)[/tex]: This structure represents an ether, where an oxygen atom is bonded to two carbon atoms. It does not match the aldehyde structure.
2. [tex]\( R-||_C^O-R \)[/tex]: There seems to be a notation issue here, but it likely aims to represent a structure with a carbonyl group (C=O) flanked by two "R" groups on either side, such as [tex]\( R-CO-R \)[/tex], which describes a ketone. A ketone has the carbonyl carbon bonded to two alkyl or aryl groups, differing from an aldehyde that has at least one hydrogen attached to the carbonyl.
3. [tex]\( R-\frac{O}{C}-O R \)[/tex]: This structure appears to imply [tex]\( RCOOR \)[/tex], which is characteristic of an ester. An ester includes a carbonyl group bonded to an oxygen atom that is also bonded to another carbon-containing group.
4. [tex]\( R -\underset{ C }{ O }- OH \)[/tex]: This notation represents [tex]\( R-COOH \)[/tex], which is a carboxylic acid. It contains a carbonyl group bonded to a hydroxyl group (OH), distinguishing it from an aldehyde.
Therefore, upon reviewing all the options, none of them match the aldehyde functional group, which is [tex]\( R-CHO \)[/tex].
Consequently, the correct answer is:
None of the above
Now let's analyze each given option:
1. [tex]\( R - O \)[/tex]: This structure represents an ether, where an oxygen atom is bonded to two carbon atoms. It does not match the aldehyde structure.
2. [tex]\( R-||_C^O-R \)[/tex]: There seems to be a notation issue here, but it likely aims to represent a structure with a carbonyl group (C=O) flanked by two "R" groups on either side, such as [tex]\( R-CO-R \)[/tex], which describes a ketone. A ketone has the carbonyl carbon bonded to two alkyl or aryl groups, differing from an aldehyde that has at least one hydrogen attached to the carbonyl.
3. [tex]\( R-\frac{O}{C}-O R \)[/tex]: This structure appears to imply [tex]\( RCOOR \)[/tex], which is characteristic of an ester. An ester includes a carbonyl group bonded to an oxygen atom that is also bonded to another carbon-containing group.
4. [tex]\( R -\underset{ C }{ O }- OH \)[/tex]: This notation represents [tex]\( R-COOH \)[/tex], which is a carboxylic acid. It contains a carbonyl group bonded to a hydroxyl group (OH), distinguishing it from an aldehyde.
Therefore, upon reviewing all the options, none of them match the aldehyde functional group, which is [tex]\( R-CHO \)[/tex].
Consequently, the correct answer is:
None of the above
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