CBSE Class 12 Chemistry Worksheet - Haloarenes. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
1.Give IUPAC names of the following:-
(b) tert- butylchloride
(d) ethylidene chloride
(e) Ethylene dichloride
(f) ethylene dichloride
(i) allyl bromide
(j) methylene chloride
(k) benzyl chloride
2.Give reasons for the following:-
(a) Flourine is more electronegative than chlorine still dipolemoment of C-F bond is less than that of CCl bond in methylflouride & methylchloride.
(b) For the conversion of alcohols to alkyl halides, thionyl chloride is preferred over phosphorous halide or halogen acid.
(c) Conversion of alcohols to alkyl iodide is done in absence of catalyst zinc chloride.
(d) Phenol cannot be converted to halobenzene by reaction with thionyl chloride or phosphorous halide or halogen acid.
(e) Free radical halogenation of alkanes is not a very good method for preparation of holoalkanes.
(f) Electrophilic substitution of benzene with iodine requires presence of oxidizing agents like HIO3.
(g) Electrophilic substitution of benzene with fluorine is not done for preparation of flourobenzene.
(h) Finkelstein reaction is carried out in dry acetone medium.
(i) Rate of reaction between t-butyl bromide & hydroxide ion depends only on concentration of hydroxide ions.
(j) Allylic & benzylic halides show high reactivity towards SN1 reaction.
(k) Dehydrohalogenation of 2-bromopentane gives 2-pentene as the major product.
(l) Optically active 2-bromobutane on treatment with aq KOH results in formation of optically inactive product.
(m) Aryl halides are extremely less reactive towards nucleophilic substitution reactions.
(n) Rate of electrophilic substitution reactions in haloarenes is less than that of benzene.
(o) Choloform is stored in dark bottles.
(p) P-Nitrochlorobenzene can be more easily hydrolysed with aq. NaOH thatn chlorobenzene.
(q) Reaction of (-) 2-Bromo octane with aq NaOH results in formation of (+)octane-2-ol.
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