Give reasons for the following :

Concentrated sulphuric acid may be added during esterification of acetic acid.

Give balanced equations for the following conversions:

1. $\text{1,2 dibromoethane} \xrightarrow{\text{A}} \text{Acetylene} \xrightarrow{\text{B}} \text{Silver acetylide}$
2. $\text{Ethanol} \xrightarrow{\text{C}} \text{Ethene} \xleftarrow{\text{D}} \text{Ethyl iodide}$
3. $\text{Bromoethane} \xrightarrow{\text{E}} \text{Ethane} \xleftarrow{\text{F}} \text{Sodium propanoate}$
4. $\text{Sodium ethanoate} \xrightarrow{\text{G}} \text{Marsh gas} \xrightarrow{\text{G}$1} \text{Methanol} \xrightarrow{\text{G}2} \text{Methanal} \xrightarrow{\text{G}_3} \text{Methanoic acid}
5. $\text{Sodium acetate + H}$2 \xleftarrow{\text{H}} \text{Acetic acid} \xrightarrow{\text{H}1} \text{Ethyl ethanoate}

Give reasons for the following :

Isomers belonging to the same homologous series may differ in physical properties but not in chemical properties.

Select from the letters A to G the correct answer corresponding to the statements from 1 to 5 :

   A : Ammoniacal CuCl₂
   B : Trichloromethane
   C : Trichloroethane
   D : Bromine soln.
   E : Aqueous KOH
   F : Ethene
   G : Sodalime
   H : Ethanol
   I : Ethyne

1. The organic compound which forms carbon tetrachloride on reaction with chlorine.
2. The reagent which can distinguish between ethene and ethyne.
3. The substance which reacts with bromoethane to give ethanol.
4. The substance which gives bromoethane on reaction with hydrogen bromide.
5. The substance which reacts with acetic acid to give CH₃COOC₂H₅