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why can't the...

Question

why can't the carbon in the carbonyl group be included in the branched chain in the case of carbaldehyde

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Solution

Carbon will not be included in the parent chain and will be called as carbaldehyde in the following cases
1. When there is a functional group with more preference than aldehyde like carboxylic acid present in the chain then the aldehyde group will be treated as branch and will be named as carbaldehyde.
Example
CHO-CH2-CH2-COOH is 3-carbaldehyde propanoic acid (Note the carbon of aldehyde is not counted in carboxylic acid.

2. When more than one aldehyde is present in the chain then all the aldehydes are removed from the chain and named as branch
Example
CHO-CH2-CH(CHO)-CH2-CHO is propane 1,2,3 tricarbaldehyde

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