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}

Select the correct answer from the choice in brackets.

1. The vapour density of the fifth member of the homologous series of alkanes. [22/36/29]
2. The isomer of pentane which has '1' C atom attached to '4' other C atoms [n-/iso-/neo-] pentane.
3. The IUPAC name of the product of reaction of ethylene with hydrogen bromide, [ethyl bromide/bromoethane/dibromoethane]
4. The IUPAC name of methyl acetylene. [1-butyne/propyne/ethyne]
5. The functional group in ethanoic acid. [aldehydic/carboxyl/hydroxyl]

Give balanced equations for the following conversions.

1. An alkyne to an alkene.
2. An alkene to an alkane.
3. An alkane to an alcohol.
4. An alcohol to an alkene.
5. A carboxylic acid to an ammonium salt

Give reasons for the following :

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