alkanols

Secondary alkanols have two alkyl groups attached to this carbon atom.

Tertiary alkanols have three alkyl groups.

Alkanols (alcohols)

Primary alkanols have no more than one alkyl group attached to the carbon atom linked to the -OH group.

In long-chain alkanols (B) hydrocarbon chain segments are located further from hydroxyl group and are more flexible than in short-chain alkanols.

Originally, "nor" had an ambiguous meaning, as the term "normal" could also refer to the unbranched form in a series of isomers, for example as with alkanes, alkanols and some amino acids.