How do the boiling point and melting point of hydrocarbons change with an increase in molecular mass?

While cooking,if the bottom of the vessel is getting blackened on the outside,it means that:

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

Which substance is obtained by the reduction of methanal?

Name the functional group of the following compounds:
$(i) \ R-COOH$
$(ii) \ R-COOR'$
$(iii) \ R-OH$
$(iv) \ R-X$

What is used to make vinegar?