Which of the following is/are “not correct” for $C{H}_{3}OH+C{H}_{3}COOH$ mixture Solution?
1. $\Delta H_{mix}<0$
2. Does not obey Raoult’s law
3. $\Delta H_{mix}>0$
4. An example of ideal solution. 
 

In $C{H}_{3}OHandC{H}_{3}COOH$   
Mixture solution, A-A and B-B Interactions are weaker than  A-B interactions. It leads to increase in vapour pressure and  positive deviation Raoult’s law.  For solutions showing positive  deviation from Raoult’s law. 
$\Delta H_{mix}>0and\Delta V_{mix}>0$ 
Thus, 1 and 4 are incorrect.