Hydrocarbons are organic compounds composed entirely of two types of atoms: carbon and hydrogen. Hydrocarbons are typically colourless gases with very weak odours. Hydrocarbons can have simple or complex structures and are classified into four subcategories: alkanes, alkenes, alkynes, and aromatic hydrocarbons. The study of hydrocarbons can provide insight into the chemical properties and preparation of other functional groups.
Download Class 11 Chemistry Worksheet on Chapter 13 Hydrocarbons – Set 2 PDF
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CBSE Class 11 Chemistry Chapter 13 Hydrocarbons – Set 2
Q-1: What are the marked positions known in the disubstituted benzene compounds?
Q-2: Which of the following is used in the synthesis of benzene?
a) Ethyne
b) Phenol
c) Furan
d) Both a) and b)
Q-3: The number of 𝝅 and 𝝈- bonds in ethyl benzene is respectively _________.
a) 3 and 13
b) 13 and 3
c) 3 and 12
d) 12 and 3
Q-4: Why is the eclipsed form of ethane the least stable?
Q-5: Find the decreasing order of reactivity towards electrophilic substitution reaction in chlorobenzene, 2,4-dinitrochlorobenzene and p-nitrochlorobenzene.
Q-6: What is an isomerisation reaction? Give an example.
Q-7: Find the product obtained in the following cases.
a) C3H8 undergoes combustion.
b) In the presence of molybdenum oxide, methane undergoes partial oxidation at high pressure.
Q-8: Give two examples of carcinogenic substances and explain how they cause cancer.
Q-9: The trans form of alkene is found to be less polar than the cis form. Why?
Q-10: What is the relation between the given three structures? 
Q-11: Give an example of a dehalogenation reaction for the preparation of an alkene from vicinal dihalides.
Q-12: Why do we get isopropyl benzene on treating benzene with 1-chloropropane instead of n-propyl benzene?
Q-13: Which of the following compounds can form during the free radical chlorination of methane?
a) C2H6
b) CH2Cl2
c) CCl4
d) All of the above
Q-14: Why can’t methane be produced using the electrolytic process developed by Kolbe?
Q-15: What is the name for the process wherein higher alkanes break down into lower alkanes when heat is applied?
a) Cracking
b) Isomerisation
c) Aromatisation
d) Oxidation
Q-16: Draw the resonance structures of benzaldehyde and tell which position is more prone to electrophilic substitution.
Q-17: Write the molecular structures of various chain alkane isomers that match to the formula C6H14. Also, provide their IUPAC names.
Q-18: Draw cis and trans isomers of the following compounds.
a) (COOH)CH=CH(COOH)
b) (C2H5)CCH3=CCH3(C2H5)
Q-19: Complete the given reaction.
a) CH3-C≡C-CH3
b) CH3C(CH3)=CH2
Q-20: Alkyl hydrogen sulphate is produced when cold conc. H2SO4 is added to alkene via an electrophilic addition reaction. Which rule is followed in this reaction? State the rule.
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