What is the molecular formula of formalin?

Which of the following statements are usually correct for carbon compounds?
$(i)$ Are good conductors of electricity
$(ii)$ Are poor conductors of electricity
$(iii)$ Have strong forces of attraction between their molecules
$(iv)$ Do not have strong forces of attraction between their molecules

$(a)$ How is vinegar made?
$(b)$ What is glacial acetic acid? What is its melting point?
$(c)$ Why are carboxylic acids called weak acids?
$(d)$ Write the name and the formula of the two compounds formed when the ester $CH_{3}COOC_{2}H_{5}$ undergoes saponification.

Name the reaction which is commonly used in the conversion of vegetable oils to fats. Explain the reaction involved in detail.

What is the monomer unit of Teflon?

What is the boiling point of methanal (in $,K$)?