Thermal Decomposition of Alkanes

Q. The process in which higher hydrocarbons are broken down into lower hydrocarbons by controlled pyrolysis, is called

1. Hydrolysis
2. Cracking
3. Oxidation

4. Reduction

Q. What is the order of heat of combustion of the following ?
(i) Heptane
(ii) Pentane
(iii) 2-Methyl pentane
(iv) 2, 2-Dimethyl butane

1. (i) > (ii) > (iii) > (iv)
2. (iv) > (iii) > (ii) > (i)
3. (i) > (iii) > (iv) > (ii)
4. (i) > (iii) > (ii) > (iv)

Q. Name the reaction
$C_{10}{H}_{22}\stackrel{900K}{\to }{C}_4{H}_8+C_6{H}_{14}$

1. Alkylation

2. Cracking

3. Pyrolysis
4. Fractionation