1)     H2SO4 will give H+ AND secondary carbocation will be formed.............

therefore ans is

       Ph---CH - (CH3)₂

2)SAME ANS & SAME ANALYSIS AS IN 1

3) ITS VERY LARGE.........U JUST NOTE THE EQUATION.............

THAT IT BENZALDEHYDE + HCN ----->  Ph---(C=O)---C(OH)--Ph

4)

ans is Ph--I

5) I THINK OZONOLYSIS OF P- XYLENE NOT POSSIBLE.....................

THANKU