Expert email validator serial. Expert Email Validator free download. Get the latest version now. Expert Email Validator gives you the possibility to check your email addresses. Share2Downloads provides softwares and cracks. If you have software or keygen to share, feel free to submit it to us here. Or you may contact us if you have software that needs to be removed from our website. Download Previous Year Question Papers for CBSE Class 12-science Chemistry with solutions on Topperlearning. Prepare with these board papers and score more. ![]() CBSE Class 12 Chemistry Worksheet - Haloarenes - Practice worksheets for CBSE students. Prepared by teachers of the best CBSE schools in India. HALOARENES 1.Give IUPAC names of the following:- (a) Iso-butylchloride (b) tert- butylchloride (c) neo-pentylbromide (d) ethylidene chloride (e) Ethylene dichloride (f) ethylene dichloride (g) bromoform (h) vinylchloride (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. 3.An alkylhalide A on reaction with Mg in dry ether followed by ethanol gave 2-methylbutane. Write structure of A & all its isomers. CuH8 when treated with dil. H2SO4 gives B. B with concn HCl + ZnCl2 gives C. C+ sodium ethoxide gives back A. Identify A,B,C. Give all reactions. 5.Give one chemical test to distinguish between chlorobenzene and benzyl chloride. Students must free download and practice these worksheets to gain more marks in exams. CBSE Class 12 Chemistry Worksheet - Haloarenes. • • • • • • • NCERT Test No. 3 by Venkat Sir of Pandit Deendayal Petroleum University (PDPU) UPSC Study centre, Gandhinagar, Gujarat. • 100 questions from NCERT Class 11 (All subjects) • Previous two tests, covered NCERT Class 7, 8, 9 and 10 all subjects. They’re available at • Upcoming tests: NCERT Class 12 (all subjects) and India Yearbook: Chapter 12 onwards 1. Consider the following about Hominids • The earliest hominid fossils belong to the genus Australopithecus • They have been found in East Africa • They have a smaller brain than Hominoids • They have an upright posture and bipedal locomotion Which is/are CORRECT? • 1 Only • 2 & 3 Only • 3 Only • 1, 2 & 4 2. Consider the following about Mesopotamia • A Land between the Euphrates and the Tigris rivers • Mesopotamian Gilgamesh epic stands as the oldest piece of epic in western literature • Uruk was one of the most important cities of Mesopotamia • In Mesopotamian society the nuclear family was the norm Which is/are CORRECT? • 1, 2 & 3 Only • 1 & 3 Only • 2 & 4 Only • All the above 3. An empire could be maintained by pastoral people for a long time and with success. This was established by Answer choices • Alexander • Genghis Khan • Constantine • Julius Caesar 4. A peptide hormone called Atrial Natriuretic Factor (ANF) is important for Answer choices • Stimulation of secretion of water • Stimulation of formation of RBC • Decreasing blood pressure • Growth of tissues 5. Consider the following • The central neural system (CNS) includes the brain and the spinal cord and is the site of information processing and control • The afferent nerve fibres transmit regulatory impulses from the CNS to the concerned peripheral tissues/organs Which is/are CORRECT? • 1 Only • 2 Only • 1 & 2 • None of the above 6. Consider the following about Structure/parts of a neuron • Nissl’s granules • Henle’s loop • Nodes of Ranvier • Schwann cells Which is/are INCORRECT? • 1 & 4 Only • 2 Only • 2 & 3 Only • 1, 3 & 4 7.
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