Alcohol
-OH (hydroxy group)
Aldehyde
C=O (carbonyl group)
Alkane
single bond (not functional group)
Alkene
double bond
Alkyne
triple bond
Amide
-CONH2, -CONHR, -CONR2
Amine
-NH2 (amino group)
Aromatic compound
phenyl group
Organic acid
-COOH (carboxyl group)
Ester
-COOR
Ether
-OR (alkoxy group)
Ketone
-C=O (carbonyl group)