
In order of preference while selecting the principal functional group which compounds are preferable to ketones: (This question has multiple correct options)
A. alcohols
B. anhydrides
C. aldehydes
D. alkenes
Answer
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Hint: Carboxylic acids and their derivatives have highest priority. The general form of Carboxylic acid is . hen The carbonyl group and its derivatives have the highest priority. Ketone ( ) is a carbonyl derivative. So find the carboxyl groups and carbonyl groups present in the given options and those will be the required answers.
Complete step by step solution:
We are given to find the compounds with principal functional groups which have higher priority than ketones.
First one is alcohol. Alcohols are compounds containing hydroxyl groups ( ) as a functional group. It is not a derivative of a carboxylic acid or a carbonyl group.
Second one is anhydrides. Anhydrides are derivatives of carboxylic acids. In anhydrides, two acyl groups are joined by only one oxygen atom. General form of an anhydride is . It is a carboxylic acid derivative.
Third one is aldehydes. Aldehydes are carbonyl derivatives. The general form of an aldehyde is .
Fourth one is Alkenes. Alkene compounds have carbon-carbon double bonds (C=C). These are not a derivative of a carboxylic acid or a carbonyl group.
Therefore as we can see, anhydride is a carboxylic acid derivative and has the highest priority.
Aldehydes and ketones are carbonyl derivatives. Aldehydes have a higher priority than ketones. Because of the presence of two alkyl groups in a ketone, its priority decreases.
The priority order is Anhydride>Aldehyde>Ketone>Alcohols>Alkenes.
Anhydrides and aldehydes have higher priority than ketones.
Therefore, Option B and Option C are correct.
Note:
Do not confuse between an aldehyde and a ketone. Aldehyde and ketone both incorporate a carbonyl functional group ( ). Aldehyde is a type of ketone where one R-group of ketone is replaced with a hydrogen atom. Presence of a hydrogen atom attached to carbon-oxygen double bond is seen in aldehyde whereas it is not seen in a ketone.
Complete step by step solution:
We are given to find the compounds with principal functional groups which have higher priority than ketones.
First one is alcohol. Alcohols are compounds containing hydroxyl groups (
Second one is anhydrides. Anhydrides are derivatives of carboxylic acids. In anhydrides, two acyl groups are joined by only one oxygen atom. General form of an anhydride is
Third one is aldehydes. Aldehydes are carbonyl derivatives. The general form of an aldehyde is
Fourth one is Alkenes. Alkene compounds have carbon-carbon double bonds (C=C). These are not a derivative of a carboxylic acid or a carbonyl group.
Therefore as we can see, anhydride is a carboxylic acid derivative and has the highest priority.
Aldehydes and ketones are carbonyl derivatives. Aldehydes have a higher priority than ketones. Because of the presence of two alkyl groups in a ketone, its priority decreases.
The priority order is Anhydride>Aldehyde>Ketone>Alcohols>Alkenes.
Anhydrides and aldehydes have higher priority than ketones.
Therefore, Option B and Option C are correct.
Note:
Do not confuse between an aldehyde and a ketone. Aldehyde and ketone both incorporate a carbonyl functional group (
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