Which of the following is an ideal solution?

$A$ mixture of ethanol and acetone shows positive deviation from Raoult's law because:

Which of the following form an ideal solution?
$I$. Chloroethane and bromoethane
$II$. Benzene and toluene
$III$. $n$-hexane and $n$-heptane
$IV$. Phenol and aniline

$A$ liquid solution is formed by mixing $10 \, moles$ of aniline and $20 \, moles$ of phenol at a temperature where the vapour pressure of pure liquid aniline and phenol are $90 \, mmHg$ and $87 \, mmHg$ respectively. The possible vapour pressure of the solution at that temperature is ............. $mmHg$.

Liquids $A$ and $B$ form an ideal solution. Which of the following statements is true?

$A$ mixture of benzene and toluene forms