Which of the following should be the FOURTH sentence after rearrangement? 1. D 2. C 3. E 4. B 5. F DIRECTIONS (Q Nos. 21-25) Read these sentences to find out whether there is any grammatical mistake/error in them. The error‚ if any‚ will be in one part of the sentence. Mark the part with the error as your answer. If
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GAS CHROMATOGRAPHY EXPERIMENT The purpose of this experiment is for the student: 1) to learn the general theoretical aspects of gas chromatography as a separation method‚ 2) to learn how to operate gas chromatographs specific to COD‚ 3) to become familiar with using the gas chromatograph (GC) to qualitatively identify components of mixtures‚ 4) to be introduced to and to interpret the quantitative data available via gas chromatography‚ 5) to gain insight into how the GC technique is used
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greater stability. Kawai (Sci. Papers Inst. Phys. Chem. Res.‚ 1925‚ 3‚ 263) has shown that the monoallyl ether of pyrocatechol undergoes the Claisen rearrangement to give an oil which he considered to be a mixture of 3- and 4-allyl-1‚2-dihydroxybenzene. This matter has now been reinvestigated and‚ by repeated fractionation of the product of the rearrangement‚ both of the above isomerides have been isolated in a pure state as colourless‚ crystalline solids melting at 28°C and 48°C respectively. As further
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(b) Propose a mechanism for the acid-catalyzed rearrangement. CHEM
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When comparing the theoretical yield versus the actual yield‚ the results obtained deviated slightly from what was expected; the percent yield was 81.53% and approximately one gram of product was lost. Steps that most likely resulted in loss of product could be due to volatility of the product. The experiment required several transferring methods causing the products to be exposed to air and allowing evaporation when it was not covered. The literature boiling point for 4-methylcyclohexene is 101-102
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WWW.JAGRANJOSH.COM Solved Practice Question Set on English Language for IBPS PO Exam 2012:Set- 2 Solved Practice Question Set on English Language for IBPS PO Exam 2012:Set- 2 Directions-(Q. 1-15) Read the following passage carefully and answer the questions given below it. Certain words / phrases have been printed in bold to help you locate them while answering some of the questions. India is rushing headlong towards economic success and modernisation‚ counting on high tech industries such
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Chemistry of Sunscreens “Over 400 years ago‚ Copernicus declared that the sun was the center of our universe. Primitive societies in every continent have worshiped the sun as the god that provided warmth and made the crops grow” Today‚ the sun is not something we worship but something we try to avoid due to the fact that we are aware that it contains two main sources of ultraviolet radiation that is harmful to our bodies. Ultraviolet radiation (UVR) is defined by wavelengths‚ and is divided
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Sun plays the most significant role in the evolution of every thing incredibly present on the Planet Earth.Sun is not only the just the source of light‚ but it also very well known as source of extensive UV Rays (Ultra Violet) ‚ Vitamin D ‚ and the only thing through which photosynthesis in plants is possible. However due to numbers of benefits‚ it ’s worst side can ’t be forgotten. Now days most of the part the world especially Australia is reviving the cases for the patients of Skin Caner
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Melvin Calvin was an American biochemist who studied various fields of science. He made many important contributions to biology‚ and even more in the broad topic of science. Among his main interests were biology‚ chemistry‚ radiation chemistry‚ photochemistry‚ artificial photosynthesis‚ organic geochemistry‚ the origin of life‚ and uses of oils from plants for more energy sources. Of those many areas of research and experimentation‚ he made significant contributions of discovering the “dark” reactions/Calvin
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Urban overcrowding is not a fresh happening‚ but it has recently become an international demographic trouble. The growth of the world’s ’Megacities’ such as Tokyo‚ Jakarta‚ Sao Paulo and Cairo‚ with populations approaching 20 million‚ is one of the most marked trends of recent decades. In 1950 for instance‚ New York City was only one of its kind among the world’s cities in having more than 10 million inhabitants. By 1975 that number had grown to 15 million
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