The compound which does not possess a peroxide linkage is

In which of the following reactions does $H_2O_2$ act as a reducing agent?

Which statement regarding $H_2O_2$ is correct?

In which of the following reactions is hydrogen peroxide $(H_2O_2)$ a reducing agent?

When $H_{2}O_{2}$ is shaken with an acidified solution of $K_{2}Cr_{2}O_{7}$ in the presence of ether,the ethereal layer turns blue due to the formation of

Electrolysis of $X$ gives $Y$ at anode. Vacuum distillation of $Y$ gives $H_2O_2$. The number of peroxy $(O-O)$ bonds present in $X$ and $Y$ respectively are :