Which has highest `pk_(a)` value
A. `R_(3)C-NH_(2)`
B. `R_(2)NH`
C. `R-NH_(2)`
D. `NH_(3)`.

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1 Answers

Correct Answer - D
Only `2^(@)` and `3^(@)` amines do not liberate `N_(2)` on reaction with `HNO_(2)`. All the given amines are `1^(@)` except tri-methylamine which is `3^(@)`. Thus, option (A) is correct.

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