Many nitrogen-containing compounds engage in a proton-transfer equilibrium that is analogous to keto-enol tautomerism: HX--N===Z X== N - ZH Each of the following compounds

Many nitrogen-containing compounds engage in a proton-transfer equilibrium that is analogous to keto-enol tautomerism:
HX--N===Z ‡Œ X== N - ZH
Each of the following compounds is the less stable partner of such a tautomeric pair. Write the structure of the more stable partner for each one.
(a)
CH3CH2N==O
(b) (CH3)2C == CHNHCH3
(c)

(d)

(e)

CH CH-N NH NH OH HN-C NH2