Explain addition and hydrogenation reactions of hydrocarbons and write any one use of hydrogenation reaction.

Elimination of hydrogen bromide from $2$-bromobutane results in the formation of

The given reaction is

Propyne and propane can be distinguished by 

$3 \mathrm{mL}$ of ethanol is taken in a test tube and warmed gently in a water bath. A $5 \%$ solution of alkaline potassium permanganate is added first, drop by drop to this solution, then in excess.

• How is $5 \%$ solution of ${\mathrm{KMnO}}_4$ prepared?
• State the role of alkaline potassium permanganate in this reaction. What happens on adding it in excess?
• Write a chemical equation of this reaction.

Observe the following chemical equation of carbon compound.

${\mathrm{CH}}_3\mathrm{Cl}+ {\mathrm{Cl}}_{2 }\stackrel{\mathrm{In} \mathrm{presence} \mathrm{of} \mathrm{sunlight}}{\to } \mathrm{X}+ \mathrm{HCl}$

Name of the chemical reaction and the product ‘x’ respectively :

When a vegetative oil is treated with hydrogen in the presence of nickel catalyst it forms Vanaspati (vegetative Ghee). This is an example of 

Incomplete combustion of coal and petroleum:

(A) increases air pollution.

(B) increases efficiency of machines.

(C) reduces global warming.

(D) produce poisonous gases.

The correct option is: