Please refer to CBSE Class 12 Chemistry HOTs Haloalkanes And Haloarenes. Download HOTS questions and answers for Class 12 Chemistry. Read CBSE Class 12 Chemistry HOTs for Unit 10 Haloalkanes and Haloarenes below and download in pdf. High Order Thinking Skills questions come in exams for Chemistry in Class 12 and if prepared properly can help you to score more marks. You can refer to more chapter wise Class 12 Chemistry HOTS Questions with solutions and also get latest topic wise important study material as per NCERT book for Class 12 Chemistry and all other subjects for free on Studiestoday designed as per latest CBSE, NCERT and KVS syllabus and pattern for Class 12
Unit 10 Haloalkanes and Haloarenes Class 12 Chemistry HOTS
Class 12 Chemistry students should refer to the following high order thinking skills questions with answers for Unit 10 Haloalkanes and Haloarenes in Class 12. These HOTS questions with answers for Class 12 Chemistry will come in exams and help you to score good marks
HOTS Questions Unit 10 Haloalkanes and Haloarenes Class 12 Chemistry with Answers
Case Based Questions :
Free radical chlorination or bromination of alkanes usually gives a complex mixture of isometric mono and poly- haloalkane which is difficult to separate into pure compounds . For example , chlorination of propane yield 1-Chloropropane and 2 -Chloropropane in addition to polychlorinated products .Therefore ,haloalkanes are generally not prepared in laboratory by halogenation of alkanes .However, in certain cases Where formation of isometric products is not possible or where there is large difference in the reactivity of halogen attached to different carbon atoms ,this method can be used for the preparation of haloalkanes
Question. How many isometric monochloinated products are possible for iso-pentane?
(a) 3.
(b) 4.
(c) 5.
(d) 6
Answer: B
Question. Which of the following halide cannot be prepared in good yield by free radical halogenatom of corresponding hydrocarbon?
(a) Benzyl chloride.
(b) Allyl chloride.
(c) neo-Pentyl chloride.
(d) iso- Pentyl chloride
Answer: D
Question. Chlorination of methane in the presence of light yield a mixture of CH3Cl ,CH2Cl2,CHCl3 and CCl4 The most polar compound among these is .
(a) CH3Cl.
(b) CH2Cl2.
(c) CCl4
(d) CHCl3
Answer: B
Question. Which of the following lighter than water?
(a) CCl4.
(b) CH2Cl2.
(c) CH3Cl.
(d) CHCl3
Answer: C
Short type Question And Answers
Question. Why haloalkanes are more reactive than haloarenes?
Answer: In haloarenes, there is partial double bond character b/w carbon and halogen due to resonance effect which makes him less reactive.
(ii) In benzene, carbon being sp2 hybridised which is smaller in size than sp3 present in haloalkanes. So C–Cl bond in aryl halides is shorter and stronger.
Question. Why do haloalkenes under go nucleophillic substitution whereas haloarenes under go electophillic substitution?
Answer: Due to more electro negative nature of halide atom in haloalkanes carbon atom
becomes slightly positive and is easily attacked by nucleophillic reagents. While in haloarenes due to resonance, carbon atom becomes slightly negative and attacked by electrophillic reagents.
Question. The treatment of alkyl chlorides with aqueous KOH lead to the formation of alcohols but in presence of alcoholic KOH alkenes are major products. Explain?
Answer: In aqueous KOH,OH– is nucleophile which replaces another nucleophile.
R-X + KOH → R-OH + KX
Where as in alcoholic KOH, C2H5O– ion is produced which is a strong base hence b-elimination took place to form alkane
C2H5OH + KOH → C2H5O- + K+
CH3CH2-Cl + alcoholic KOH → CH2 = CH2 + C2H5OH
Question. Explain why vinyl chloride is unreactive in nucleophillic substitution reaction?
Answer: Vinyl chloride is unreactive in nucleophillic substitution reaction because of double bond character between C–Cl bond which is difficult to break.
Question. Arrange the following compounds according to reactivity towards nucleophillic substitution reaction with reagents mentioned :-
(i) 4-nitrochlorobenzene> 2,4 dinitrochlorobemzene > 2,4,6, trinitrochlorobenzene with CH3ONa
Answer: ,4,6, trinitrochlorobenzene > 2,4 dinitrochlorobemzene > 4- nitrochlorobenzene
Question. Why Grignard reagent should be prepared under an hydrous conditions?
Answer: Grignard reagent react with H2O to form alkanes, therefore they are prepared under anhydrous condition.
Question. Why is Sulphuric acid not used during the reaction of alcohols wiht KI?
Answer: It is because HI formed will get oxidized to I2 by concentrated Sulphuric acid which is an oxidizing agent.
Question. p-dichlorobenzene has highest m.p. than those of ortho and m-isomers?
Answer: p-dichlorobenzene is symmetrical, fits into crystal lattice more readily and has higher melting point.
Question. Give reasons:
(i) C–Cl bond length in chlorobenzene is shorter than C–Cl bond in CH3Cl.
(ii) The dipole moment of chlorobenzene is lower than that of cyclohexyl chloride.
(iii) SN1 reactions are accompained by racemization in optically active alkyl halides.
Answer: (i) In chlorobenzene, each carbon atom is sp2 hybridised/ resonating structures / partial donable bond character.
(ii) Due to + R effect in chlorobenzene / difference in hybridization i.e., sp2 and sp3 respectively.
(iii) Due to formation of planer carbocation.
More Questions..
1 Iodoform gives the precipitate with AgNO3 on heating while chloroform does not. Give reasons
2 The following reaction give 2 products. Write their structures .
3 Predict the products of the following reactions:
a. HCl with CH3CCl=CH2
b. HBr with CH3CH=C(CH3)2
4 Monochlorination of ethane to ethyl chloride is more practical than chlorination of npentane. Give reasons
5 An optically active compound having molecular formula C7H15Br reacts with aq. KOH to give racemic mixture of products. Write the mechanism involved in the reaction. [hint: a carbocation being planar, allows attack of nucleophile from either direction.]
6 a. Which of the following 2 compounds would react faster by SN2 pathway:- 1- bromobutane or 2-bromobutane and why?
b. Allyl chloride is more reactive than n-propyl chloride towards nucleophilic substitution reaction. Explain why?
c. Haloalkanes react with KCN to give alkyl cyanides as main product while with AgCN, they form isocyanide as the main product. Give reasons.
7 In each of the following pairs of organic compounds, identify the compound which will undergo SN1reaction faster. Also give reason with related structures.
8 p-nitrobenzene undergoes nucleophilic substitution faster than chlorobenzene. Explain giving the resonating structures as well.
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HOTS for Unit 10 Haloalkanes and Haloarenes Chemistry Class 12
Expert teachers of studiestoday have referred to NCERT book for Class 12 Chemistry to develop the Chemistry Class 12 HOTS. If you download HOTS with answers for the above chapter you will get higher and better marks in Class 12 test and exams in the current year as you will be able to have stronger understanding of all concepts. High Order Thinking Skills questions practice of Chemistry and its study material will help students to have stronger understanding of all concepts and also make them expert on all critical topics. You can easily download and save all HOTS for Class 12 Chemistry also from www.studiestoday.com without paying anything in Pdf format. After solving the questions given in the HOTS which have been developed as per latest course books also refer to the NCERT solutions for Class 12 Chemistry designed by our teachers. We have also provided lot of MCQ questions for Class 12 Chemistry in the HOTS so that you can solve questions relating to all topics given in each chapter. After solving these you should also refer to Class 12 Chemistry MCQ Test for the same chapter
You can download the CBSE HOTS for Class 12 Chemistry Unit 10 Haloalkanes and Haloarenes for latest session from StudiesToday.com
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HOTS stands for "Higher Order Thinking Skills" in Unit 10 Haloalkanes and Haloarenes Class 12 Chemistry. It refers to questions that require critical thinking, analysis, and application of knowledge
Regular revision of HOTS given on studiestoday for Class 12 subject Chemistry Unit 10 Haloalkanes and Haloarenes can help you to score better marks in exams
Yes, HOTS questions are important for Unit 10 Haloalkanes and Haloarenes Class 12 Chemistry exams as it helps to assess your ability to think critically, apply concepts, and display understanding of the subject.