How do I compare the -M effect due aldehyde and a carboxylic acid? Which will have stronger mesomeric effect?
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$\begingroup$ Nope ronith the link you gave gives -I order and not -M order $\endgroup$– AmitCommented May 3 at 6:17
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$\begingroup$ @Ronith that is the inductive effect order. Mesomeric effect is different $\endgroup$– Aarush SaharanCommented May 3 at 13:15
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$\begingroup$ oh my bad i am so sorry. $\endgroup$– RonithCommented May 3 at 13:33
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An aldehyde would surely have higher $-M$ effect than a carboxylic acid.
Because in a Carboxylic acid there is an $-OH$ group resonating with the $\ce{C=O}$. Hence lowering it's $-M$ effect on the other neighboring group.
Whereas in an aldehyde the $\ce{C=O}$ have more electrophilic nature than carboxylic acid and hence have higher $-M$.
$$Aldehyde$$
$$Carboxylic Acid$$
