In Class 11 Final Exams there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Downloads of CBSE Class 11 Chemistry Chapter 13 Case Study and Passage-Based Questions with Answers were Prepared Based on the Latest Exam Pattern. Students can solve Class 11 Chemistry Case Study Questions Hydrocarbons to know their preparation level.
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In CBSE Class 11 Chemistry Paper, There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
Hydrocarbons Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 11 Chemistry Chapter 13 Hydrocarbons
Case Study/Passage-Based Questions
Case Study 1: Compound (A) is an important industrial feed stock, but its largest use is as the fuel for the oxyacetylene torch. It is a colorless, foul-smelling gas that burns in the air with a yellow, sooty flame.
Identify the product A.
(a) ethane (b) ethyne
(c) ethene (d) methane
Answer: (b) ethyne
The compound (B) formed is
(a) cyclohexane (b) benzene
(c) hexane (d) cyclopentane.
Answer: (c) hexane
(a) nucleophilic substitution mechanism
(b) electrophilic addition mechanism
(c) electrophilic subsituition mechanism
(d) elimination reaction mechanism.
Answer: (c) electrophilic subsituition mechanism
The product E is
(a) nitrobenzene
(b) benzene sulphonic acid
(c) both (a) and b (d) none of these.
Answer: (b) benzene sulphonic acid
Identify the product ‘D’.
(a) Chlorobenzene (b) Bromobenzene
(c) Toluene (d) Acetophenonone
Answer: (d) Acetophenonone
Case Study 2:Carbon-carbon double bond in alkenes consists of one strong sigma (σ) bond (bond enthalpy about 397 kJ mol–1) due to head-on overlapping of sp 2 hybridised orbitals and one weak pi (π) bond (bond enthalpy about 284 kJ mol–1) obtained by lateral or sideways overlapping of the two 2p orbitals of the two carbon atoms. The double bond is shorter in bond length (134 pm) than the C–C single bond (154 pm). You have already read that the pi (π) bond is a weaker bond due to poor sideways overlapping between the two 2p orbitals. Thus, the presence of the pi (π) bond makes alkenes behave as sources of loosely held mobile electrons. Therefore, alkenes are easily attacked by reagents or compounds which are in search of electrons. Such reagents are called electrophilic reagents. The presence of weaker π-bond makes alkenes unstable molecules in comparison to alkanes and thus, alkenes can be changed into single-bond compounds by combining with the electrophilic reagents. The strength of the double bond (bond enthalpy, 681 kJ mol–1) is greater than that of a carbon-carbon single bond in ethane (bond enthalpy, 348 kJ mol–1).
What does the carbon-carbon double bond in alkenes consist of?
A) One sigma (σ) bond and one pi (π) bond
B) Two sigma (σ) bonds
C) Two pi (π) bonds
D) One sigma (σ) bond only
Answer: A
What is the bond enthalpy of the sigma (σ) bond in alkenes?
A) 284 kJ mol–1
B) 397 kJ mol–1
C) 681 kJ mol–1
D) 348 kJ mol–1
Answer: B
How does the bond length of the double bond in alkenes compare to the C–C single bond?
A) The double bond is longer
B) The double bond is the same length
C) The double bond is shorter
D) The information is not given
Answer: C
What makes the pi (π) bond in alkenes weaker?
A) Head-on overlapping of sp² hybridised orbitals
B) Strong sideways overlapping between the two 2p orbitals
C) Poor sideways overlapping between the two 2p orbitals
D) Greater bond length
Answer: C
Why are alkenes easily attacked by electrophilic reagents?
A) The presence of a strong sigma (σ) bond
B) The presence of a weaker pi (π) bond
C) The absence of pi (π) bond
D) The stability of alkenes in comparison to alkanes
Answer: B
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