How many secondary amines are possible with the formula C₅H₁₃N.

Write the IUPAC names of the following compounds,

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Write the IUPAC names of the following compounds: ${\mathrm{C}}_6{\mathrm{H}}_5-\mathrm{N}{\left({\mathrm{CH}}_3\right)}_2$.

Write the IUPAC name of 

Give the IUPAC name of ${\left({\mathrm{CH}}_3\right)}_2\mathrm{N}-{\mathrm{C}}_2{\mathrm{H}}_5$.

A secondary amine is a/an _______.