When are the compounds called normal $(n-)$? Give an example.

(N/A) In organic chemistry,the prefix $n-$ (short for normal) is used to denote a straight-chain alkane where all carbon atoms are linked in a continuous,unbranched chain.
This means that no carbon atom is attached to more than two other carbon atoms.
For example,$CH_3-CH_2-CH_2-CH_3$ is called $n$-butane.