What is the common name of ethanoic acid?

$CH_{3}COOCH_{3}$ is the molecular formula of which compound?

Write the names of the next homologues of $CH_{3}CH_{2}OH$ and $HCOOH$.

An element is a main constituent of paper,diamond and clothes etc. It forms covalent bonds with itself and other elements.
$(a)$ Identify the element.
$(b)$ Write the electron dot structure of its oxide.
$(c)$ Draw the electron dot structure of methane and ethane.

Which two of the following compounds belong to the same homologous series?
$C_{2}H_{6}O, C_{2}H_{6}O_{2}, C_{2}H_{6}, CH_{4}O$

$(a)$ Differentiate between soap and detergent.
$(b)$ Explain why soaps form scum with hard water,whereas detergents do not.