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JEE • CHEMISTRY • HYDROCARBONS
Hydrocarbons practice · Mixed difficulty
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Practice format and chapter quiz
These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.
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Showing 181-210 of 269 questions
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181
Hard
181 of 269
Remembering
+4 | -1
Angle strain in cyclopropane is
View answer and explanation
Correct option: A
Option A () is correct because it represents the calculated angle strain in cyclopropane based on its geometry.
182
Easy
182 of 269
Application
+4 | -1
The mass of produced by the combustion of 60 g of in excess of oxygen is
View answer and explanation
Correct option: D
176 g
Option D (176 g) is correct because it is calculated based on the stoichiometry of the combustion reaction of ethane.
183
Medium
183 of 269
Application
+4 | -1
A mixture of and on passing over heated gives:
View answer and explanation
Correct option: B
Option B () is correct because the reaction of CS2 and H2S over heated Cu produces methane and sulfur.
184
Easy
184 of 269
Analyzing
+4 | -1
A hydrocarbon has the formula . To find out whether it contains two double bonds or triple bonds, the following test is performed:
View answer and explanation
Correct option: A
Passed through ammoniacal
Option A is correct because passing the hydrocarbon through ammoniacal AgNO3 will identify terminal alkynes (containing a triple bond at the end of the chain).
185
Easy
185 of 269
Understanding
+4 | -1
Which of these does not follow anti-Markownikoff’s rule?
View answer and explanation
Correct option: A
2-butene
Option A (2-butene) is correct because anti-Markownikoff's rule applies only to asymmetric alkenes, and 2-butene is a symmetric alkene.
186
Medium
186 of 269
Application
+4 | -1
Major product formed in the following reaction is
View answer and explanation
Correct option: D
Option D () is correct because it follows Markovnikov's rule, where the bromine adds to the more substituted carbon.
187
Medium
187 of 269
Understanding
+4 | -1
On passing electric discharge through graphite in presence of the compound formed is:
View answer and explanation
Correct option: D
All of these
Option D is correct because passing an electric discharge through graphite in the presence of hydrogen can lead to the formation of methane, ethane, and acetylene.
188
Easy
188 of 269
Understanding
+4 | -1
The number of isomeric xylenes is:
View answer and explanation
Correct option: B
3
Option B (3) is correct because there are three possible isomers of xylene: ortho-xylene, meta-xylene, and para-xylene.
189
Medium
189 of 269
Remembering
+4 | -1
n-hexadecane (cetane) has cetane number:
View answer and explanation
Correct option: A
100
Option A (100) is correct because n-hexadecane (cetane) is assigned a cetane number of 100 by definition.
190
Easy
190 of 269
Understanding
+4 | -1
Propadiene, molecule contains:
View answer and explanation
Correct option: A
Two and one -hybrid carbon
Option A (Two and one -hybrid carbon) is correct because the propadiene molecule has two terminal carbons with hybridization and one central carbon with hybridization.
191
Easy
191 of 269
Understanding
+4 | -1
In chlorobenzene, the group:
View answer and explanation
Correct option: B
Deactivates the benzene ring more via inductive effect than activating it via resonance effect
Option B (Deactivates the benzene ring more via inductive effect than activating it via resonance effect) is correct because the inductive effect of chlorine is stronger than its resonance effect, leading to overall deactivation.
192
Easy
192 of 269
Analyzing
+4 | -1
(A): In the Kolbe's electrolysis of two moles of in aqueous solution, lit of gases evolved at pressure and .
(R) Kolbe's electrolysis of aqueous solution of involves free radical mechanism.
(R) Kolbe's electrolysis of aqueous solution of involves free radical mechanism.
View answer and explanation
Correct option: B
Both A and R are correct, R is not the correct explanation of A
The correct answer is B because both the assertion and the reason are correct, but the reason is not the correct explanation for the assertion.
193
Medium
193 of 269
Application
+4 | -1
Which of the following compounds react with, an aqueous solution of ?
View answer and explanation
Correct option: C
1-butyne
Option C (1-butyne) is correct because terminal alkynes react with ammoniacal silver nitrate due to the acidity of the terminal hydrogen.
194
Medium
194 of 269
Application
+4 | -1
View answer and explanation
Correct option: A
2 – chloropropane
Option A (2 – chloropropane) is correct because the reaction follows Markovnikov's rule in the presence of peroxide.
195
Medium
195 of 269
Analyzing
+4 | -1
2-methylpropene is isomeric with butane-1. They can be distinguished by:
View answer and explanation
Correct option: D
Option D () is correct because ozonolysis followed by reductive workup produces different carbonyl compounds for 2-methylpropene and butane-1.
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196
Easy
196 of 269
Remembering
+4 | -1
The preparation of ethane by electrolysis of aqueous solution of potassium acetate is called as
View answer and explanation
Correct option: D
Kolbe's synthesis
Option D (Kolbe's synthesis) is correct because the electrolysis of aqueous potassium acetate results in the formation of ethane via Kolbe's electrolysis.
197
Medium
197 of 269
Analyzing
+4 | -1
Which of the following will not produce ethane
View answer and explanation
Correct option: B
reduction of with
Option B (reduction of with ) will produce propane, not ethane.
198
Easy
198 of 269
Remembering
+4 | -1
The carbide which reacts with water to form ethyne is
View answer and explanation
Correct option: A
Option A (CaC2) is correct because calcium carbide (CaC2) reacts with water to produce ethyne (acetylene).
199
Easy
199 of 269
Remembering
+4 | -1
Paraffin dissolves in:
View answer and explanation
Correct option: B
Benzene
Option B (Benzene) is correct because paraffin (alkanes) and benzene are both non-polar substances, and \"like dissolves like.\"
200
Medium
200 of 269
Remembering
+4 | -1
The most stable conformational isomer of cyclohexane is:
View answer and explanation
Correct option: A
Chair form
Option A (Chair form) is correct because the chair conformation of cyclohexane is the most stable due to minimal torsional and steric strain.
201
Easy
201 of 269
Understanding
+4 | -1
Sodium formate on heating with soda lime gives:
View answer and explanation
Correct option: C
Option C () is correct because sodium formate, when heated with soda lime, undergoes decarboxylation to produce hydrogen gas.
202
Easy
202 of 269
Remembering
+4 | -1
Petroleum is formed by the chemical changes in:
View answer and explanation
Correct option: D
Both (b) and ©
Option D (Both (b) and (c)) is correct because petroleum is formed from the chemical changes in both vegetable and animal matter over millions of years.
203
Hard
203 of 269
Application
+4 | -1
At constant temperature and pressure, the percentage of butane by volume in a mixture of butane, propane and propyne is What will be the volume of (in ml) under same pressure and temperature produced, when 150 ml of gaseous mixture is burnt in excess of
View answer and explanation
Correct option: C
510 ml
Option C (510 ml) is correct because it's the total volume of CO2 produced from the combustion of the mixture.
204
Medium
204 of 269
Remembering
+4 | -1
Among the following number of meta directing groups are:
View answer and explanation
Correct option: A
5
Option A (5) is correct because there are five meta-directing groups among the listed substituents: -CN, -NO2, -COOH, -SO3H, and -NH3+.
205
Medium
205 of 269
Remembering
+4 | -1
Which of the following has the least octane number?
View answer and explanation
Correct option: D
-heptane
Option D ( -heptane) is correct because n-heptane is assigned an octane number of 0, representing very poor antiknock properties.
206
Medium
206 of 269
Understanding
+4 | -1
The common name and IUPAC name of , respectively are
View answer and explanation
Correct option: B
ethylacetylene and but-1-yne
The correct answer is A (Liquid solvent, solid solvent) because during the depression of freezing point, the liquid solvent and solid solvent are in equilibrium.
207
Easy
207 of 269
Understanding
+4 | -1
Electrophile in the case of chlorination of Benzene
View answer and explanation
Correct option: C
Option C () is correct because the electrophile in the chlorination of benzene is the chloronium ion ().
208
Easy
208 of 269
Remembering
+4 | -1
The tar which is used to make roads is a solid known as:
View answer and explanation
Correct option: A
Pitch
Option A (Pitch) is correct because pitch is a viscous, black, thermoplastic material derived from coal tar or petroleum and is used as a binder in road construction.
209
Easy
209 of 269
Application
+4 | -1
In which of the following will Kharasch effectoperate?
View answer and explanation
Correct option: B
Option B () is correct because Kharasch effect (anti-Markovnikov addition) operates with HBr in the presence of peroxides.
210
Medium
210 of 269
Analyzing
+4 | -1
In the reaction the correct statement about is
View answer and explanation
Correct option: D
Both 1 and 2
Option D is correct because after the given reactions, A is acetic acid and B is sodium acetate, which on decarboxylation gives methane and on Kolbe's electrolysis gives ethane.
Revision notes and key takeaways
Review HYDROCARBONS in your textbook or class notes, then use this set to check your understanding.
Showing 181-210 of 269 questions
