Top 150+ Solved Alkane MCQ Questions Answer
Q. The most important method of preparation of hydrocarbons of lower carbon number is………….
a. Pyrolysis of higher carbon number hydrocarbons
b. Electrolysis of salts of fatty acids
c. Sabatier and Senderen's reaction
d. Direct synthesis
Q. The inorganic origin of petroleum is indicated by the fact that…………..
a. Its constituents can be separated by fractional distillation
b. Carbon and hydrocarbon can combine by absorption of solar energy to give hydrocarbons
c. Petroleum contains traces of chlorophyll
d. Oil fields are located with the help of seismograph
Q. By Wurtz reaction, a mixture of methyliodide and ethyliodide gives………….
a. Butane
b. Ethane
c. Propane
d. A mixture of the above three
Q. Product obtained by nitration of propane is …………….
a. Nitropropane
b. Nitromethane
c. Nitroethane
d. All of these
Q. Isomerism in saturated hydrocarbons is due to…………..
a. Change in the valence of carbon
b. Change in the ratio of elements in compounds
c. Formation of branches in the chain of C atoms
d. Formation of double bond
Q. Which of the following is not linked with methane………….
a. Marsh gas
b. Natural gas
c. Producer gas
d. Coal gas
Q. Which of the following has highest octane number…………..
a. n-hexane
b. n-heptane
c. Iso-octane
d. n-heptane and iso-octane mixed in ratio 50 : 50
Q. A mixture of ethyl iodide and n-propyl iodide is subjected to Wurtz reaction. The hydrocarbon that will not be formed is…………..
a. n-butane
b. n-propane
c. n-pentane
d. n-hexan
Q. Most of the hydrocarbons from petroleum are obtained by…………….
a. Fractional distillation
b. Fractional crystallization
c. Vaporization
d. Polymerization
Q. Which is the best antiknock compound or Which one of the following substances is used as anantiknock compound ……………
a. Lead tetrachloride
b. Lead acetate
c. Zinc ethyl
d. Tetraethyl lead (TEL)
Q. Which of the following cycloalkane gives open chain compound, when reacts withbromine………..
a. Cyclopropane
b. Cyclopentane
c. Cyclohexane
d. Cyclo-octane
Q. Grignard reagent is not prepared in aqueous medium but prepared; in ether medium because thereagent…………..
a. Reacts with water
b. Is insoluble in water
c. Is highly reactive in ether
d. Becomes inactive in water
Q. Photochemical chlorination of alkane is initiated by a process of……………
a. Pyrolysis
b. Substitution
c. Cracking
d. Homolysis