Among the following structures, which will show the most stable enamine formation? (Where Me is $$-$$CH₃)

Which statement is not true with respect to nitrate ion test?

For complete combustion of methanol

CH₃OH(I) + $${3 \over 2}$$O₂(g) $$\to$$ CO₂(g) + 2H₂O(I)

the amount of heat produced as measured by bomb calorimeter is 726 kJ mol^$$-$$1 at 27$$^\circ$$C. The enthalpy of combustion for the reaction is $$-$$x kJ mol^$$-$$1, where x is ___________. (Nearest integer)

(Given : R = 8.3 JK^$$-$$1 mol^$$-$$1)

A 0.5 percent solution of potassium chloride was found to freeze at $$-$$0.24$$^\circ$$C. The percentage dissociation of potassium chloride is ______________. (Nearest integer)

(Molal depression constant for water is 1.80 K kg mol^$$-$$1 and molar mass of KCl is 74.6 g mol^$$-$$1)