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Alcohol
-OH (hydroxy group)

Aldehyde
C=O (carbonyl group with hydrogen

Alkane
single bond (not functional group)

Alkene
double bond

Alkyne
triple bond

Amide
-CONH2, -CONHR, -CONR2 (Carboxamide)

Amine
-NH2 (amino group)

Arene
aromatic ring

Carboxylic acid
-COOH (Carboxyl)

Ester
-COOR (Carboxylate)

Ether (Glycosidic) linkage
-OR (alkoxy group)

Ketone
-C=O (carbonyl group)

Aldehyde

Halide
-F
- Cl
- Br
- I

hydroxyl
R-OH

Carbonyl
C=O

Nitrile
C triple bond N

Ketone
RCOR

diol
two hydroxyl groups

triol
Alcohol with 3 hydroxyl groups

diene
a hydrocarbon with two double bonds

alkyl group
An alkane with a hydrogen atom removed, e.g. CH3, C2H5; alkyl groups are often shown as 'R'.

oxo
A prefix occasionally used for carbonyl group (C=O) used for naming aldehydes (-al) and ketones (-one) when there is another functional group that takes priority (eg oic acids)

hydroxy-
Alcohol- A prefix occasionally used for the hydroxyl group (-OH) when there is another functional group that takes priority (eg oic acids)
