Hydrocarbons Class 11 Worksheet with Answers & Notes

Classification of Hydrocarbons

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Classification of Hydrocarbons under Hydrocarbons for Grade 11 CBSE.

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1.
$Which of the following is NOT an aliphatic hydrocarbon?$
A. $Methane$
B. $Ethane$
C. $Propyne$
D. $Benzene$
2.
$Identify the formula of Hexane.$
A. $C_{6}H_{12}$
B. $C_{6}H_{10}$
C. $C_{6}H_{14}$
D. $C_{6}H_{6}$
3.
$How many double bonds are present in a molecule of benzene?$
A. $1$
B. $2$
C. $3$
D. $6$
4.
$A cyclic compound that contains one or more benzene rings is termed as:$
A. $Non-benzenoid aromatic$
B. $Benzenoid aromatic$
C. $Alicyclic$
D. $Paraffin$
5.
$In the broad classification of hydrocarbons, into which two primary categories are they first divided?$
A. $Saturated and Unsaturated$
B. $Acyclic and Cyclic$
C. $Aromatic and Alicyclic$
D. $Benzenoid and Non-benzenoid$
6.
$Which of the following is the characteristic functional group arrangement for 'Alkynes' in classification?$
A. $-C=C-$
B. $-C \equiv C-$
C. $-C-C-$
D. $Benzene ring$
7.
$Identify the classification for a hydrocarbon molecule where the carbon atoms are arranged in a closed ring and are linked by double bonds, but do not follow Huckel's rule.$
A. $Benzenoid aromatic$
B. $Non-benzenoid aromatic$
C. $Alicyclic (unsaturated)$
D. $Acyclic (unsaturated)$
8.
$The compound Bicyclo[1.1.0]butane is one of the most strained hydrocarbons. How many tertiary carbons does it contain according to its classification?$
A. $0$
B. $1$
C. $2$
D. $4$
9.
$Which of the following is true for the classification of 'Norbornane'?$
A. $It is a fused bicyclic alkane.$
B. $It is a bridged bicyclic alkane.$
C. $It is a spiro bicyclic alkane.$
D. $It is an aromatic polycyclic hydrocarbon.$
10.
$(4n) \pi$
A. $Aromatic to Non-aromatic$
B. $Anti-aromatic to Non-aromatic$
C. $Non-aromatic to Anti-aromatic$
D. $Anti-aromatic to Aromatic$

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Alkanes - Nomenclature, Isomerism, Preparation and Properties

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Alkanes - Nomenclature, Isomerism, Preparation and Properties under Hydrocarbons for Grade 11 CBSE.

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1.
$What is the composition of soda lime used in the decarboxylation reaction?$
A. $NaOH + Ca(OH)_2$
B. $NaOH + CaO$
C. $Na_2CO_3 + CaO$
D. $KOH + CaO$
2.
$The melting points of alkanes with an even number of carbon atoms are higher than those with an odd number because of:$
A. $Higher molecular mass$
B. $Better packing in the crystal lattice$
C. $Lower surface area$
D. $Presence of more methyl groups$
3.
$During the chlorination of methane, which radical is formed first after the initiation step?$
A. $Chlorine radical$
B. $Methyl radical$
C. $Ethyl radical$
D. $Hydrogen radical$
4.
$Which alkane has the highest boiling point among the following?$
A. $n-Butane$
B. $n-Pentane$
C. $n-Hexane$
D. $n-Heptane$
5.
$CH_{3}COONa$
A. $X = Ethane, Y = Methane$
B. $X = Methane, Y = Ethane$
C. $X = Methane, Y = Propane$
D. $X = Ethane, Y = Ethane$
6.
$-CH(CH_{3})CH_{2}CH_{3}$
A. $Isobutyl$
B. $sec-butyl$
C. $tert-butyl$
D. $n-butyl$
7.
$SO_{2}Cl_{2}$
A. $Reed's reaction$
B. $Frankland reaction$
C. $Dumas reaction$
D. $Wurtz-Fittig reaction$
8.
$What is the correct order of the ease of abstraction of hydrogen atoms in alkanes during free radical halogenation?$
A. $1^{\circ} > 2^{\circ} > 3^{\circ}$
B. $3^{\circ} > 2^{\circ} > 1^{\circ}$
C. $2^{\circ} > 3^{\circ} > 1^{\circ}$
D. $3^{\circ} > 1^{\circ} > 2^{\circ}$
9.
$Which of the following hydrocarbons is a liquid at room temperature?$
A. $Propane$
B. $Butane$
C. $Pentane$
D. $Ethane$
10.
$Identify the number of chiral centers in the alkane 3-methylhexane.$
A. $0$
B. $1$
C. $2$
D. $3$

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Alkenes - Nomenclature, Structure of Double Bond, Geometrical Isomerism, Preparation and Properties

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Alkenes - Nomenclature, Structure of Double Bond, Geometrical Isomerism, Preparation and Properties under Hydrocarbons for Grade 11 CBSE.

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1.
$Zn$
A. $ZnO$
B. $ZnCl_2$
C. $ZnSO_4$
D. $Zn(OH)_2$
2.
$CH_3-CH=C(CH_3)-CH_2-CH_3$
A. $3-Methylpent-2-ene$
B. $2-Ethylbut-2-ene$
C. $3-Methylpent-3-ene$
D. $Hex-2-ene$
3.
$What happens to the boiling point of alkenes as the molecular mass increases?$
A. $It decreases$
B. $It remains constant$
C. $It increases$
D. $It first increases then decreases$
4.
$Alkynes can be reduced to trans-alkenes using:$
A. $Lindlar's catalyst$
B. $Sodium in liquid ammonia$
C. $KMnO_4$
D. $Nickel catalyst at high temperature$
5.
$In the E-Z nomenclature system, the E-isomer is the one where high-priority groups are:$
A. $On opposite sides of the double bond$
B. $On the same side of the double bond$
C. $Attached to the same carbon atom$
D. $Perpendicular to the double bond plane$
6.
$CH_2=CH-CH(CH_3)_2$
A. $3-Methylbut-1-ene$
B. $2-Methylbut-3-ene$
C. $Isopentene$
D. $2-Isopropyl-ethene$
7.
$Ag$
A. $Ethylene oxide (Epoxyethane)$
B. $Ethanal$
C. $Ethanoic acid$
D. $Ethanol$
8.
$sp^2$
A. $4$
B. $6$
C. $5$
D. $3$
9.
$Which of the following involves a syn-addition mechanism?$
A. $Addition of Br2 in CCl4$
B. $Addition of HBr$
C. $Hydrogenation using Lindlar's catalyst$
D. $Addition of HCl in the presence of peroxide$
10.
$Which alkene on ozonolysis gives only cyclopentanone?$
A. $Cyclopentene$
B. $1,2-Dimethylcyclopentene$
C. $1,1'-Bicyclopentenyl$
D. $Cyclopentylethene$

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Alkynes - Nomenclature, Structure of Triple Bond, Preparation and Properties

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Alkynes - Nomenclature, Structure of Triple Bond, Preparation and Properties under Hydrocarbons for Grade 11 CBSE.

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1.
$sp$
A. $1$
B. $2$
C. $3$
D. $4$
2.
$Which of the following is a pair of position isomers?$
A. $Ethyne and Propyne$
B. $But-1-yne and But-2-yne$
C. $But-1-yne and But-1-ene$
D. $Propyne and Cyclopropene$
3.
$C_6H_{10}$
A. $Hex-1-yne$
B. $Hex-2-yne$
C. $Hex-3-yne$
D. $Hex-1-ene$
4.
$H_2SO_4$
A. $Propanal$
B. $Propan-1-ol$
C. $Propanone$
D. $Propan-2-ol$
5.
$HC \equiv CH$
A. $Hex-3-yne$
B. $Pent-2-yne$
C. $Pent-1-yne$
D. $Hex-2-yne$
6.
$Which of the following alkynes has the IUPAC name 4,4-dimethylpent-2-yne?$
A. $CH_3-C \equiv C-C(CH_3)_3$
B. $(CH_3)_2CH-C \equiv C-CH_3$
C. $CH_3-CH_2-C \equiv C-CH(CH_3)_2$
D. $(CH_3)_3C-CH_2-C \equiv CH$
7.
$Alkynes are generally _______ in water and _______ in organic solvents.$
A. $Insoluble, Soluble$
B. $Soluble, Insoluble$
C. $Insoluble, Insoluble$
D. $Soluble, Soluble$
8.
$C_5H_8$
A. $Hexan-2-one and Hexan-3-one$
B. $3-Methylpentan-2-one and Hexan-2-one$
C. $4-Methylpentan-2-one and 2-Methylpentan-3-one$
D. $Hexanal and Hexan-2-one$
9.
$HCl$
A. $2-Chloro-1-iodobutane$
B. $2-Chloro-2-iodobutane$
C. $1-Chloro-2-iodobutane$
D. $2,2-Diiodobutane$
10.
$A hydrocarbon 'X' decolorizes bromine water and gives a red precipitate with ammoniacal cuprous chloride. 'X' is:$
A. $CH_2=CH_2$
B. $CH \equiv CH$
C. $CH_3-CH_3$
D. $C_6H_6$

Download the worksheet for Hydrocarbons - Alkynes - Nomenclature, Structure of Triple Bond, Preparation and Properties to practice offline. It includes additional chapter-level practice questions.

Aromatic Hydrocarbons - Nomenclature, Benzene Structure and Aromaticity

Subtopic

Aromatic Hydrocarbons - Nomenclature, Benzene Structure and Aromaticity under Hydrocarbons for Grade 11 CBSE.

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1.
$Aromatic hydrocarbons are classified into two main categories based on their structural features. According to the classification flowchart provided, what is the term used for 'Group X' which includes molecules like Benzene and Naphthalene?$
A. $Non-benzenoid$
B. $Benzenoid$
C. $Acyclic$
D. $Aliphatic$
2.
$Which of the following is NOT a requirement for a compound to be aromatic?$
A. $It must be cyclic$
B. $It must be planar$
C. $It must be a liquid at room temperature$
D. $(4n+2) \pi$
3.
$What is the IUPAC name for chlorobenzene?$
A. $Chlorobenzene$
B. $Phenyl chloride$
C. $1-Chlorobenzene$
D. $Both A and C$
4.
$\pi$
A. $4$
B. $6$
C. $8$
D. $10$
5.
$p$
A. $In the same plane as the carbon atoms$
B. $45^\circ$
C. $Perpendicular to the plane of the ring$
D. $C-H$
6.
$Which of the following is the molecular formula for Anthracene?$
A. $C_{10}H_8$
B. $C_{12}H_{10}$
C. $C_{14}H_{10}$
D. $C_{14}H_{12}$
7.
$-OCH_3$
A. $Anisole$
B. $Acetone$
C. $Aniline$
D. $Toluene$
8.
$In the molecule of Pyridine, where is the lone pair of electrons on the nitrogen atom located?$
A. $p$
B. $sp^2$
C. $sp^3$
D. $s$
9.
$The resonance hybrid of benzene is more stable than any single canonical structure by:$
A. $The sum of the bond energies of all C-C and C=C bonds.$
B. $The resonance energy.$
C. $p$
D. $The heat of formation.$
10.
$What is the IUPAC name of the compound where a benzene ring is attached to a 3-carbon chain at the 2nd carbon, and the 1st carbon of the chain has a bromine atom?$
A. $1-bromo-2-phenylpropane$
B. $2-bromo-1-phenylpropane$
C. $(1-bromopropyl)benzene$
D. $3-bromo-2-phenylpropane$

Download the worksheet for Hydrocarbons - Aromatic Hydrocarbons - Nomenclature, Benzene Structure and Aromaticity to practice offline. It includes additional chapter-level practice questions.

Chemical Properties of Benzene and Electrophilic Substitution Reactions

Subtopic

Chemical Properties of Benzene and Electrophilic Substitution Reactions under Hydrocarbons for Grade 11 CBSE.

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1.
$Complete combustion of benzene in excess air produces water and which gas?$
A. $Carbon monoxide$
B. $Carbon dioxide$
C. $Methane$
D. $Sulfur dioxide$
2.
$Who is credited with the discovery of benzene in 1825?$
A. $Michael Faraday$
B. $August Kekulé$
C. $Joseph Priestley$
D. $Antoine Lavoisier$
3.
$The phenyl group is represented by which of the following formulas?$
A. $C_6H_6-$
B. $C_6H_5-$
C. $C_6H_7-$
D. $C_6H_4-$
4.
$Which of the following observations is NOT true for benzene?$
A. $It is a planar molecule$
B. $It decolorizes bromine water$
C. $It undergoes substitution reactions$
D. $It has six identical C-C bonds$
5.
$-Cl$
A. $-I$
B. $+I$
C. $-R$
D. $High electronegativity; Small size$
6.
$H_3PO_4$
A. $n-propylbenzene$
B. $Isopropylbenzene$
C. $Ethylbenzene$
D. $1,2-dimethylbenzene$
7.
$Why does benzene not undergo addition reactions as easily as ethylene?$
A. $Because it is cyclic$
B. $Because of its resonance stabilization energy$
C. $Because it has no double bonds$
D. $Because it is a saturated hydrocarbon$
8.
$AlCl_3$
A. $Naphthalene$
B. $Anthracene$
C. $Anthraquinone$
D. $Phenanthrene$
9.
$Which of the following observations supports the fact that the first step of electrophilic aromatic substitution is the rate-determining step for nitration?$
A. $C_6H_6$
B. $Nitration is faster than sulphonation.$
C. $Nitronium ion can be detected by spectroscopic methods.$
D. $NO_2^+$
10.
$m$
A. $1$
B. $2$
C. $3$
D. $4$

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Carcinogenicity and Toxicity

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Carcinogenicity and Toxicity under Hydrocarbons for Grade 11 CBSE.

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1.
$Which of these is a biological impact of toxic hydrocarbons on human health?$
A. $Interference with normal cell growth$
B. $Improved immunity$
C. $Faster wound healing$
D. $Stronger bones$
2.
$Environmental pollution by PAHs is largely caused by:$
A. $Human activities like burning fossil fuels$
B. $Planting trees$
C. $Natural rainfall$
D. $Solar radiation$
3.
$1,2-Benzanthracene$
A. $One$
B. $Two$
C. $Four$
D. $Ten$
4.
$Which of the following is a physical characteristic of most carcinogenic PAHs?$
A. $Highly soluble in water$
B. $Insoluble in water but soluble in organic solvents$
C. $Gaseous at room temperature$
D. $Extremely reactive with water$
5.
$Which characteristic of aromatic hydrocarbons contributes to their stability and persistence in the environment?$
A. $Presence of triple bonds$
B. $Resonance energy and delocalized pi-electrons$
C. $High solubility in rainwater$
D. $Ability to form ionic bonds with soil$
6.
$Which of the following groups on a PAH can significantly increase its carcinogenic potency?$
A. $Hydroxyl groups$
B. $Methyl groups at specific positions (e.g., 7,12-position)$
C. $Sodium salt groups$
D. $Water molecules$
7.
$What structural change occurs when naphthalene is converted to a larger PAH?$
A. $A benzene ring is lost$
B. $More benzene rings are fused to the existing structure$
C. $The rings become non-planar$
D. $Carbon atoms are replaced by nitrogen atoms$
8.
$Which of the following DNA mutations is most commonly associated with the G to T transversion caused by benzo[a]pyrene?$
A. $Point mutation in the p53 tumor suppressor gene$
B. $Silent mutation in the hemoglobin gene$
C. $Insertion of a whole new chromosome$
D. $Deletion of the entire mitochondrial genome$
9.
$During the combustion of petroleum, which condition most favors the formation of toxic PAHs?$
A. $Excess of oxygen and low temperature$
B. $Limited oxygen and high temperature$
C. $High pressure and high moisture$
D. $Presence of a noble gas catalyst$
10.
$Which of the following statements about PAH toxicity is correct regarding the 'Bay Region'?$
A. $It is a region where epoxides are extremely stable and never react$
B. $Epoxides formed adjacent to a bay region are highly reactive due to the stabilization of the resulting carbocation by resonance$
C. $The bay region prevents the molecule from entering the liver$
D. $Only linear molecules like anthracene have bay regions$

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Hydrocarbons

Classification of Hydrocarbons

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Alkanes - Nomenclature, Isomerism, Preparation and Properties

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Alkenes - Nomenclature, Structure of Double Bond, Geometrical Isomerism, Preparation and Properties

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Alkynes - Nomenclature, Structure of Triple Bond, Preparation and Properties

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Aromatic Hydrocarbons - Nomenclature, Benzene Structure and Aromaticity

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Chemical Properties of Benzene and Electrophilic Substitution Reactions

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Carcinogenicity and Toxicity

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