A: `1^(@), 2^(@), 3^(@)` Amines can be distinuished by diethyl oxalage.
R: `1^(@)` amines from `N`-alkyl oxamide solid product `2^(@)` amine form oxamic ester which is liquid `3^(@)` amine do not react.
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true R is false.
D. A is false, R is true
