Compound X with a molecular formula `C_(4)H_(11)N` did not react with Hinsberg's reagent, but reacted with one mole of `CH_(3)I` to form a salt. What is the structure of X ?

Explanation

The structure of X is `underset(" N, N-Dimethylethanamine")(H_(3)C-overset(C_(2)H_(5))overset("| ")underset(CH_(3))underset("| ")("N": ))`
Since the compound does not react with `HNO_(2)`, it must be a tertiary amine. Tertiary amine reacts with one mole of `CH_(3)I` to from a quaternary salt i.e. `[(CH_(3))_(3)N^(+)-C_(2)H_(5)]I^(-)`.