Write true or false for the following statements:

Scum is formed due to the reaction of soap with calcium and magnesium salts present in hard water.

The heteroatoms present in

CH₃ — CH₂ — O — CH₂ — CH₂Cl are:

(i) oxygen (ii) carbon

(iii) hydrogen (iv) chlorine

The first member of alkyne homologous series is:

Write true or false for the following statements:

Alcohols react with sodium leading to the evolution of carbon dioxide.

Write true or false for the following statements:

Heating ethanol at 443 K with excess concentrated sulphuric acid results in the dehydration of ethanol to give ethene.