Question:
Which group is this?
Which group is this?
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Aldehydes have -CHO group with C=O and C-H bonds.
Updated On: Jul 2, 2026
- Ketone
- Carboxylic acid
- Aldehyde
- Amide
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The Correct Option is C
Approach Solution - 1
The structure shown is a carbon double-bonded to oxygen and single-bonded to a hydrogen atom — characteristic of an aldehyde group.
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Approach Solution -2
Alternate approach — Comparative functional-group analysis:
Each carbonyl-based functional group can be distinguished by what is attached to the carbon that carries the C=O double bond. A ketone has the carbonyl carbon attached to two other carbon atoms, with no H or O directly on it. A carboxylic acid has the carbonyl carbon attached to an -OH group. An amide has the carbonyl carbon attached to a nitrogen atom. An aldehyde uniquely has the carbonyl carbon attached to at least one hydrogen atom directly, giving the characteristic -CHO group.
Since the depicted structure shows the carbonyl carbon bonded to one hydrogen and one carbon chain, it does not match a ketone, a carboxylic acid, or an amide; it uniquely fits the aldehyde pattern, confirming option Aldehyde.
Each carbonyl-based functional group can be distinguished by what is attached to the carbon that carries the C=O double bond. A ketone has the carbonyl carbon attached to two other carbon atoms, with no H or O directly on it. A carboxylic acid has the carbonyl carbon attached to an -OH group. An amide has the carbonyl carbon attached to a nitrogen atom. An aldehyde uniquely has the carbonyl carbon attached to at least one hydrogen atom directly, giving the characteristic -CHO group.
Since the depicted structure shows the carbonyl carbon bonded to one hydrogen and one carbon chain, it does not match a ketone, a carboxylic acid, or an amide; it uniquely fits the aldehyde pattern, confirming option Aldehyde.
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