Chemistry : Important Questions For CBSE Class XII ( Haloalkanes and Haloarenes) (Q.1) Choose the incorrect statement about the benzyl chloride: ( 1 mark ) (a) It is less reactive than alkyl halides. (b) It can be oxidized to benzaldehyde by boiling with copper nitrate solution. (c) It is a lachrymatory liquid and answers beilstein’s test. (d) It gives a white precipitate with alcoholic silver nitrate (Q.2) Dry ether The reaction RX + 2Na + RX _______________? R-R + 2NaXis called. ( 1 mark
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J Polym Environ (2007) 15:25–33 DOI 10.1007/s10924-006-0042-3 ORIGINAL PAPER Chemical Treatments of Natural Fiber for Use in Natural Fiber-Reinforced Composites: A Review Xue Li Æ Lope G. Tabil Æ Satyanarayan Panigrahi Published online: 4 January 2007 Ó Springer Science+Business Media‚ LLC 2006 Abstract Studies on the use of natural fibers as replacement to man-made fiber in fiber-reinforced composites have increased and opened up further industrial possibilities. Natural fibers have
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VOL 20 NO 157 REGD NO DA 1589 Dhaka‚ Saturday‚ May 04‚2013 http://www.fe-bd.com/index.php?ref=MjBfMDVfMDRfMTNfMV8yN18xNjgzMjU= Of disasters‚ negligence and liability: Nimtoli tragedy revisited Published : Saturday‚ 04 May 2013 In case of fire in garment factories and accidents in unauthorized buildings‚ the regulators like the Fire Service or Rajuk come up with arguments that the factories or buildings do not have licence or permission‚ But they cannot avoid the ‘tortfeasor
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result of experiment. Methodology Materials and Apparatus The chemicals used in the experiment are as follows: benzoic acid‚ sugar‚ denatured alcohol‚ chloroform‚ acetanilide‚ copper sulfate‚ activated charcoal‚ distilled water‚ acetone‚ toluene‚ glutamic acid and glycine. The apparatus used include funnel‚ Erlenmeyer flask‚ separatory funnel‚ beakers‚ evaporating dish‚ water bath‚ graduated cylinder‚ stirring rod‚ watch glass‚ distilling flask‚ thermometer‚ tripod‚ wire gauze‚ burner‚ iron
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Chromatographic Analysis of a Commercial Analgesic’s Active Component I. Abstract This study on Chromatographic Analysis of a Commercial Analgesic’s Active Component seeks to separate‚ identify‚ quantify and analyze the active component found in Biogesic®‚ which may be useful for public awareness despite its wide acceptance and availability in the market. Furthermore‚ this study applies thin layer chromatography (TLC) technique since it is the simplest‚ cheapest yet most effective approach in terms
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Mary Eunice Agapito‚ Denmarc R. Aranas*‚ Limuel Joseph V. Bacani‚ and Steven Arthur Baluyot Analysis of Hydrocarbons Department of Biology‚ University of Santo Tomas‚ Manila‚ Philippines Abstract In this experiment we performed parallel chemical test method to identify an unknown. The reflux setup was used to prevent evaporation in mixing the reactants in an inert solvent with its boiling point. Another highlight of this experiment is the liquid-liquid extraction wherein a solution containing
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Test Booklet Code - NO.: ABC 2216302 This Booklet contains 20 pages. Do not open this Test Booklet until you are asked to do so. Impoutant Instructions : 1. 2. The Answer Sheet is inside this Test Booklet. When you are directed to open the Test Booklet‚ take out the Answer Sheet and fill in the particulars on side-1 and side-2 carefully with blue/ black ball point pen only. The test is of 3 hours duration and Test Booklet contains 180 questions. Each question carries 4 marks
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Alkyl Halides Alkyl halides are a class of compounds where a halogen atom or atoms are bound to an sp3 orbital of an alkyl group. CHCl3 (Chloroform: organic solvent) CF2Cl2 (Freon-12: refrigerant CFC) CF3CHClBr (Halothane: anesthetic) Halogen atoms are more electronegative than carbon atoms‚ and so the C-Hal bond is polarized. H H μ C + C-l δ δ H The C-X bond is polarized in such a way that there is partial positive charge on the carbon and partial negative charge on the halogen. Dipole moment
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bacteria . E.g. strepomycin * It effective against protozao. Eg.tetracycline * It Effective against fungi. E.g. Nystain According to their chemical structure * Acylic structure This type of anti biotic comprise cyclopentane‚ cyclohexane‚ Cycloheptane derivatives. Eg. Sarcomycin‚ Thujic acid * Tetracyclic This group includes compounds similar in their structure. Eg.tetracycline * Aromatic antibiotics Antibiotics included in this group are benzene derivatives
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15. Benzene and Aromaticity • C-Phen DM Drops (Chlorpheniramine/Dextromethorp/Phenylephrine) • This combination medication is used to treat symptoms caused by the common cold‚ flu‚ allergies‚ hay fever‚ or other breathing illnesses (e.g.‚ sinusitis‚bronchitis). • One of the active ingredients is Phenylephrine –a decongestant that helps relieve stuffy nose symptoms. H HO OH H N CH3 . HCl What is the configuration at this chirality center? R or S ? www.primaryrx.com/pdf/C-PHEN%20DM%20DROPS
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