Which of the following compounds is a quaternary .

Options

A. `(CH_(3))_(3)overset(+)NHBrbar`
B. `C_(2)H_(5)overset(+)NH_(2)CH_(3)Brbar`
C. `C_(2)H_(5)overset(+)N(CH_(3))_(3)Brbar`
D. `CH_(3)overset(+)NH_(3)Brbar`

Answer

C

Explanation

Quaternary ammonium salts are derivatives of ammonium salts in which all four hydrogen atoms of the ammonium ion have been replaced by alky1 and/or ary1 groups.
`underset("salt")underset("Ammonium")(overset(+)(N)H_(3)Br^(-))rarrunderset("salt")underset("Quaternary ammonium")(C_(2)H_(5)overset(+)(N)(CH_(3))_(3)Br^(-))`
Similary, the tetra-alkyl derivatives of ammonium hydroxide, `[R_(4)N]^(+)OH^(-)` are called quaternary ammonium hydroxides.