Hydrocarbons

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Alkanes (Preparation and Reactions)

Subtopic

Alkanes (Preparation and Reactions) under Hydrocarbons for Grade 11 ICSE.

Preview questions (no answers)

1.
$Which of the following alkanes contains only primary and quaternary carbon atoms?$
A. $n-pentane$
B. $Isopentane$
C. $Neopentane$
D. $2-methylbutane$
2.
$The density of alkanes generally:$
A. $Decreases with increase in molecular mass$
B. $Increases with increase in molecular mass$
C. $Remains constant for all alkanes$
D. $Is higher than the density of water$
3.
$The reduction of alkyl halides using HI and Red Phosphorus produces which of the following?$
A. $Alkenes$
B. $Alkanes$
C. $Alkynes$
D. $Alcohols$
4.
$In Kolbe's electrolysis of sodium propionate, the alkane formed at the anode is:$
A. $Ethane$
B. $Butane$
C. $Propane$
D. $Hexane$
5.
$Which of the following reactions involves the conversion of a higher alkane into a mixture of lower alkanes and alkenes?$
A. $Aromatization$
B. $Pyrolysis$
C. $Isomerization$
D. $Sulphonation$
6.
$Al_4C_3$
A. $Al(OH)_3$
B. $Al_2O_3$
C. $AlH_3$
D. $Al_2(CO_3)_3$
7.
$Why is dry ether used as a solvent in the Wurtz reaction?$
A. $To dissolve the sodium metal$
B. $To prevent the sodium from reacting with moisture$
C. $To act as a catalyst for the reaction$
D. $To keep the alkane product in solution$
8.
$Which of the following methods would be best for preparing 2,3-dimethylbutane in high purity?$
A. $Wurtz reaction of 2-bromopropane$
B. $Wurtz reaction of a mixture of 1-bromopropane and 2-bromopropane$
C. $Decarboxylation of sodium 2,3-dimethylbutanoate$
D. $Hydrogenation of 2,3-dimethylbut-1-ene$
9.
$AlCl_{3}/HCl$
A. $Carbocation$
B. $Carbanion$
C. $Free radical$
D. $Carbene$
10.
$HI$
A. $I_{2}$
B. $Act as a dehydrating agent.$
C. $Catalyze the homolysis of the C-I bond.$
D. $Provide extra heat through its combustion.$

Download the worksheet for Hydrocarbons - Alkanes (Preparation and Reactions) to practice offline. It includes additional chapter-level practice questions.

Alkenes and Alkynes

Subtopic

Alkenes and Alkynes under Hydrocarbons for Grade 11 ICSE.

About Topic & Revision

Preview questions (no answers)

1.
$What is the product of the reaction between ethene and chlorine gas?$
A. $1,1-Dichloroethane$
B. $1,2-Dichloroethane$
C. $Chloroethane$
D. $Tetrachloroethane$
2.
$Which of the following is a balanced molecular formula for an alkene?$
A. $C_4H_{10}$
B. $C_6H_{12}$
C. $C_2H_2$
D. $CH_4$
3.
$When ethene is treated with hydrogen gas in the presence of a catalyst, the process is called:$
A. $Dehydrogenation$
B. $Hydrogenation$
C. $Hydration$
D. $Halogenation$
4.
$In the IUPAC name 'But-1-yne', what does the number '1' indicate?$
A. $The number of carbon atoms$
B. $The number of triple bonds$
C. $The position of the triple bond$
D. $The position of a methyl group$
5.
$[Ag(NH_3)_2]OH$
A. $Ethane$
B. $Ethene$
C. $Ethyne$
D. $But-2-yne$
6.
$Zn/H_2O$
A. $But-1-yne$
B. $But-2-yne$
C. $Propyne$
D. $Ethyne$
7.
$Ba(CN)_2$
A. $Acrylonitrile$
B. $Ethyl cyanide$
C. $Methyl cyanide$
D. $Vinyl chloride$
8.
$H_2$
A. $1-chloro-2-iodopropane$
B. $2-chloro-1-iodopropane$
C. $1,2-dichloro-2-iodopropane$
D. $2-iodo-2-chloropropane$
9.
$CHO-CHO$
A. $Ethyne$
B. $Ethene$
C. $1,3-Butadiene$
D. $Benzene$
10.
$The conversion of propene to 1-propanol can be best achieved by:$
A. $Acid catalyzed hydration$
B. $Hydroboration-oxidation$
C. $Oxymercuration-demercuration$
D. $KMnO_4$

Download the worksheet for Hydrocarbons - Alkenes and Alkynes to practice offline. It includes additional chapter-level practice questions.

Aromatic Hydrocarbons (Benzene)

Subtopic

Aromatic Hydrocarbons (Benzene) under Hydrocarbons for Grade 11 ICSE.

About Topic & Revision

Preview questions (no answers)

1.
$What type of hydrocarbon is benzene classified as?$
A. $Aliphatic$
B. $Alicyclic$
C. $Aromatic$
D. $Acyclic$
2.
$The electrophile in the sulphonation of benzene is usually considered to be:$
A. $H^+$
B. $SO_3$
C. $SO_4^{2-}$
D. $HSO_4^-$
3.
$The resonance energy of benzene is approximately:$
A. $36 kcal/mol$
B. $150 kcal/mol$
C. $10 kcal/mol$
D. $100 kcal/mol$
4.
$In the presence of sunlight, benzene reacts with chlorine to form which product?$
A. $Chlorobenzene$
B. $Benzyl chloride$
C. $C_6H_6Cl_6$
D. $Benzoyl chloride$
5.
$-Cl$
A. $It deactivates the ring and directs the incoming group to the meta position$
B. $It activates the ring and directs the incoming group to the ortho and para positions$
C. $It deactivates the ring and directs the incoming group to the ortho and para positions$
D. $It activates the ring and directs the incoming group to the meta position$
6.
$Which of the following compounds is NOT aromatic?$
A. $Toluene$
B. $Naphthalene$
C. $Cyclohexane$
D. $Phenol$
7.
$3$
A. $Inhalant$
B. $Insecticide$
C. $Antiseptic$
D. $Fuel additive$
8.
$Which of the following is a characteristic of an aromatic compound according to the criteria for aromaticity?$
A. $The molecule must be non-planar.$
B. $(4n + 2)\ \pi$
C. $sp^3$
D. $The molecule must undergo addition reactions more easily than substitution reactions.$
9.
$Zn/CH_3COOH$
A. $Formaldehyde$
B. $Acetaldehyde$
C. $Glyoxal$
D. $Oxalic acid$
10.
$The conversion of Sodium Benzoate to Benzene using Sodalime is a:$
A. $Reduction reaction$
B. $Decarboxylation reaction$
C. $Oxidation reaction$
D. $Substitution reaction$

Download the worksheet for Hydrocarbons - Aromatic Hydrocarbons (Benzene) to practice offline. It includes additional chapter-level practice questions.

Carcinogenicity and Toxicity

Subtopic

Carcinogenicity and Toxicity under Hydrocarbons for Grade 11 ICSE.

About Topic & Revision

Preview questions (no answers)

1.
$Which statement about carcinogenic PAHs is correct?$
A. $They are easily washed away by rain because they are polar$
B. $They are formed by the complete combustion of carbon into CO2$
C. $They are products of the incomplete combustion of fuels$
D. $They are essential nutrients for human growth$
2.
$What is the primary environmental danger of oil spills regarding PAHs?$
A. $They increase the saltiness of the water$
B. $They release toxic and carcinogenic PAHs into the marine ecosystem$
C. $They make the water too warm for fish$
D. $They prevent the moon from reflecting on the water$
3.
$Which of the following structural features is typically associated with the carcinogenicity of a PAH?$
A. $A long straight carbon chain$
B. $The 'bay region' or specific fused ring geometry$
C. $Presence of triple bonds between all carbons$
D. $Lack of any hydrogen atoms$
4.
$Which of the following is a result of the 'bioaccumulation' of PAHs?$
A. $Concentrations decrease as we move up the food chain$
B. $Concentrations increase in the tissues of organisms over time$
C. $PAHs are converted into oxygen by fish$
D. $PAHs disappear from the ecosystem instantly$
5.
$What is the primary reason that PAHs are considered 'indirect' carcinogens?$
A. $They are not toxic until they are breathed in$
B. $They require metabolic activation within the body to become reactive$
C. $They only cause cancer in the second generation of offspring$
D. $They must be dissolved in alcohol to be dangerous$
6.
$Polynuclear aromatic hydrocarbons are primarily produced by the 'cracking' of which type of natural resource?$
A. $Limestone$
B. $Petroleum and Coal$
C. $Quartz$
D. $Cellulose$
7.
$Which of the following genes is a frequent target for mutations caused by Benz[a]pyrene adducts, leading to uncontrolled cell growth?$
A. $The p53 tumor suppressor gene$
B. $The hemoglobin gene$
C. $The insulin gene$
D. $The keratin gene$
8.
$What is the biological significance of the 'Diol-epoxide' metabolite being 'bulky'?$
A. $It makes the molecule sink to the bottom of the cell.$
B. $It allows the molecule to be easily digested by lysosomes.$
C. $It creates a physical distortion in the DNA helix that is difficult for standard repair enzymes to fix correctly.$
D. $It increases the boiling point of the cell cytoplasm.$
9.
$The presence of which element as a substituent in a PAH structure often significantly alters its metabolic pathway and increases its direct-acting mutagenicity?$
A. $Helium$
B. $-NO_2$
C. $Sodium$
D. $Argon$
10.
$Which of the following statements about the solubility of carcinogenic PAHs is correct?$
A. $They are highly soluble in water, allowing them to circulate freely in the blood.$
B. $They are lipophilic (fat-soluble), which allows them to cross cell membranes and accumulate in fatty tissues.$
C. $They are insoluble in both water and lipids.$
D. $Their solubility increases as the number of fused rings increases.$

Download the worksheet for Hydrocarbons - Carcinogenicity and Toxicity to practice offline. It includes additional chapter-level practice questions.

Hydrocarbons

Alkanes (Preparation and Reactions)

❓Preview questions (no answers)

Alkenes and Alkynes

❓Preview questions (no answers)

Aromatic Hydrocarbons (Benzene)

❓Preview questions (no answers)

Carcinogenicity and Toxicity

❓Preview questions (no answers)

Preview questions (no answers)

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