An organic compound X with molecular formula ${\mathrm{C}}_2{\mathrm{H}}_4{\mathrm{O}}_2$, turns blue litmus red and gives brisk effervescence with sodium bicarbonate. Identify the compound. 

Which of the following statements is not correct?

$2 \mathrm{mL}$ of ethanoic acid was taken in each of the three test tubes A, B and C. To these test tubes $2 \mathrm{mL}, 4 \mathrm{mL}$ and $8 \mathrm{mL}$ of water was added respectively. Which test tube will give a clear solution?

Compound $\mathrm{X}$ has the molecular formula ${\mathrm{C}}_2{\mathrm{H}}_6\mathrm{O}$.

1. $\mathrm{X}$ can be made by fermentation process.

2. $\mathrm{X}$ can be oxidised to $\mathrm{Y}$.

3. $\mathrm{X}$ can react with $\mathrm{Y}$ to form $\mathrm{Z}$ and water.

To which homologous series do $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$ belong?