In Class 12 Boards 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 Download of CBSE Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes Case Study and Passage Based Questions with Answers were Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Chemistry Case Study Questions Haloalkanes and Haloarenes to know their preparation level.
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In CBSE Class 12 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.
Haloalkanes and Haloarenes Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes
Case Study/Passage-Based Questions
Case Study 1: A chlorocompound (A) on reduction with Zn-Cu and ethanol gives the hydrocarbon (B) with five carbon atoms. When (A) is dissolved in dry ether and treated with sodium metal it gave 2,2,5,5 tetramethylhexane. The treatment of (A) with alcoholic KCN gives compound (C).
(i) The compound (A) is
| (a) 1-chloro- 2, 2-dimethylpropane | (b) 1-chloro- 2, 2-dimethyl butane |
| (c) 1-chloro-2-methyl butane | (d) 2-chloro-2-methyl butane. |
Answer: (a) 1-chloro- 2, 2-dimethylpropane.
(ii) The reaction of (C) with Na, C2H5OH gives
| (a) (CH3)3C CH2CONH2 | (b) (CH3)3C NH2 |
| (c) (CH)3C CH2CH2NH2 | (d) (CH3)2CHCH2NH2 |
Answer: (c) (CH)3C CH2CH2NH2
(iii) The reaction of (C) with Na, C2H5OH is called
| (a) Gilman reaction | (b) Mendius reaction |
| (c) Grooves process | (d) Swart’s reaction. |
Answer: (b) Mendius reaction
(iv) Compound (B) is
| (a) n-pentane | (b) 2, 2-dimethylpropane |
| (c) 2-methylbutane | (d) none of these. |
Answer: (b) 2, 2-dimethylpropane
Case Study 2: Nucleophilic substitution reactions are of two types; substitution nucleophilic bimolecular (SN2) and substitution nucleophilic unimolecular (SN1) depending on molecules taking part in determining the rate of reaction. The reactivity of alkyl halide towards SN1 and SN2 reactions depends on various factors such as steric hindrance, stability of intermediate or transition state and polarity of solvent. SN2 reaction mechanism is favored mostly by primary alkyl halide or transition state and polarity of the solvent, SN2 reaction mechanism is favored mostly by primary alkyl halide then secondary and then tertiary. This order is reversed in the case of SN1 reactions.
(i) Which of the following is most reactive towards nucleophilic substitution reaction?
(a) C6H5Cl
(b) CH2=CHCl
(c) ClCH2CH=CH2
(d) CH3CH=CHCl
Answer: (c) ClCH2CH=CH2
(ii) Isopropyl chloride undergoes hydrolysis by
(a) SN1 mechanism
(b) SN2 mechanism
(c) SN1 and SN2 mechanism
(d) neither SN1 nor SN2 mechanism
Answer: (c) SN1 and SN2 mechanism
(iii) The most reactive nucleophile among the following is
(a) CH3O-
(b) C6H5O-
(c) (CH3)2CHO-
(d) (CH3)3CO-
Answer: (a) CH3O-
Which of the following is the correct order of decreasing SN2 reactivity?
(a) RCH2X > R2CHX > R3CX
(b) R3CX > R2CHX >RCH2X
(c) R2CHX >R3CX > RCH2X
(d) RCH2X >R3CX >R2CHX
Answer: (a) RCH2X > R2CHX > R3CX
Case Study 3: A primary alkyl halide (A) C4H9Br reacted with alcoholic KOH to give compound (B). Compound (B) is reacted with HBr to give compound (C) which is an isomer of (A). When (A) reacted with sodium metal, it gave a compound (D) C8H18 that is different than the compound obtained when n-butyl bromide reacted with sodium metal
(i) Which type of isomerism is present in compounds (A) and (C)?
| (a) Positional | (b) Functional | (c) Chain | (d) Both (a) and (c) |
Answer: (c) Chain
(ii) IUPAC name of compound (D) is
| (a) n-octane | (c) 2-dimethyl heptane | (c) 2-methylheptane | (d) 3,4-dimethyl hexane. |
Answer: (c) 2-methyl heptane
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