Some of the common Organic Chemistry functional groups are: Alkane, Alkene, Alkyne, Alkyl halide, Alcohol, Ether, Amine, Aldehyde, Ketone, Acyl chloride, Carboxylic acid, Ester and Amide. Try and remmeber them as much as possible so that you can avoid these common organic chemistry mistakes during your eaxms.
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Now, check these most recommended books for JEE Main Organic Chemistry preparation.