Why is pure acetic acid known as glacial acetic acid ?

State the term for the reaction in which the hydrogen of an alkane is replaced by chlorine.

What type of compound is formed by the reaction between acetic acid and an alcohol ?

Which of the following statements is wrong about alkanes ?

(A) They are all saturated hydrocarbons.
(B) They can undergo addition as well as substitution reactions.
(C) They are almost non polar in nature.
(D) On complete combustion give out carbon dioxide and water.