1. Hydrocarbons are organic compounds with element
a) Hydrogen
b) Oxygen
c) Carbon
d) Both hydrogen and carbon
Answer
Answer: d [Reason:] These organic compounds are made up of only carbon and hydrogen and hence the name hydrocarbons.
2. Find the odd one out:
a) Aromatic
b) Alkanes
c) Alkynes
d) Alkenes
Answer
Answer: a [Reason:] aromatic is a separate branch of hydrocarbons. Whereas the alkanes, alkenes, and alkynes are subfamilies of the branch aliphatic hydrocarbons.
3. The simplest member of organic compounds is ?
a) Methanol
b) Methane
c) Formaldehyde
d) Formic acid
Answer
Answer: b [Reason:] Methane is the simplest member of alkane family and indeed the simplest of organic compounds, as all other compounds are derived by altering this compound.
4. Ethane is obtained by electrolyzing
a) Potassium formate
b) Potassium succinate
c) Potassium acetate
d) Potassium fumarate
Answer
Answer: b [Reason:] By electrolyzing potassium succinate (the process is generally called Kolbe’s electrolysis), ethane is obtained.
5. “Methane is a product of aerobic respiration”. State true or false
a) False
b) True
Answer
Answer: a [Reason:] Methane is the end product of anaerobic decay of plants due to the breakdown of very complicated molecules.
6. Calcium carbide on reaction with water gives?
a) Methane
b) Ethane
c) propane
d) Acetylene
Answer
Answer: d [Reason:] CaC2 + H20—-> C2H2 + Ca(OH)2.
7. Name the process associated with acylation of benzene
a) Friedel craft reaction
b) Wurtz reaction
c) Wurtz fitting reaction
d) Debey Huckel reaction
Answer
Answer: a [Reason:] The electrophilic substitution reaction that takes place between ethanoyl chloride and benzene is called as Friedel craft reaction
8. The hydrocarbon in which all the 4 valencies of carbon are fully occupied is called as
a) Alkene
b) Alkyne
c) Alkane
d) Cycloalkane
Answer
Answer: c [Reason:] Alkanes , the saturated hydrocarbons are those in which the carbon atoms are bonded covalently to each other (fully occupied). Each carbon atom is tetrahedrally surrounded by H-atoms
9. Liquid hydrocarbon is converted into gaseous hydrocarbon by:
a) Oxidation
b) Hydrolysis
c) Cracking
d) Distillation
Answer
Answer: c [Reason:] Under cracking with high temperature, the liquid form of hydrocarbon is converted into gaseous form
10. Chlorination of alkanes is an example of
a) Radical
b) Elimination
c) Free radical
d) Addition
Answer
Answer: c [Reason:] Free radical chlorination is a reaction that substitutes a chlorine for a hydrogen on an alkane
