Keghan Chapter 8 MULTIPLE CHOICE QUESTIONS Topic: Structure Elucidation 1. An alkene adds hydrogen in the presence of a catalyst to give 3‚4-dimethylhexane. Ozonolysis of the alkene followed by treatment with zinc and acetic acid gives a single organic product. The structure of the alkene is: CH3 A) CH3CH=C-CHCH2CH3 (cis or trans) CH3 CH3 B) CH3CH2C=CCH3 (cis or trans) CH2CH3 C) CH3 CH2=CCH2CHCH2CH3 CH3 CH2 D) CH3CH2CCHCH2CH3 CH3 CH3 E) CH3CH2CHCHCH=CH2
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TEA Dr. B.L. Wedzicha of t h e Procter D e p a r t m e n t of Food Science‚ U n i v e r s i t y of Leeds‚ describes t h e c h e m i s t r y of black t e a manufacture Tea is the m o s t w i d e l y c o n s u m e d beverage in the w o r l d . The economic importance of an annual w o r l d production of tea estimated to be in the region of 1-1·5 million tonnes has resulted in considerable attention being paid to the understanding of the chemical and physical changes w h i c h take place during tea
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Reece). Spinach leaves contain chlorophyll a and b and b -carotene as major pigments as well as smaller amounts of other pigments such as xanthophylls. The two forms of chlorophyll are identical except that a methyl group in a is replaced by an aldehyde in b. In terrestrial plants‚ the most important pigments are chlorophyll a (blue-green)‚ chlorophyll b (yellow-green)‚ xanthophyll (yellow) and carotene
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SPRAYKE: A MIST OF CAKE An Entrepreneurial Research Project Submitted to the Faculty of the University of Perpetual Help System – Jonelta City of Biñan‚ Laguna In partial fulfillment of the requirements for the degree of Bachelor of Science in Accountancy CHAPTER 1 THE PROBLEM AND ITS SETTING Introduction “Fragrance has a power of persuasion stronger than that of words‚ appearances‚ emotions‚ or will
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FMDC 2012 ENGLISH Q ambiti0n is one of those __which is never satisfied. A) ideas B) fancies C) energies D) passions Q. The opponents were outnumbered‚ but still the commander refused to give...? A) out B) way C) over D) in Q. spot the error a. The dean of this college is a good friend of me. b. There have been heavy rainfall yesterday! Q. choose similar meanings a. barbarian (uncivilized‚ civilized) b. rude Q. choose opposite meaning
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Alkynes Chapter 7 Triple Bond Structure Nomenclature IUPAC: use the infix -yn- to show the presence of a carbon-carbon triple bond 4 3 2 1 2 3 4 6 7 5 1 2 3 4 6 7 5 1 3-Methyl-1-butyne 6‚6-Dimethyl-3-heptyne 1‚6-Heptadiyne Common names: prefix the substituents on the triple bond to the name “acetylene” IUPAC name: Common name: 2-Butyne D imethylacetylene 1-Buten-3-yne Vinylacetylene Physical Properties
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Three-Dimensional Structure of Proteins Rotation around the -Carbon in a Polypeptide A Sterically Nonallowed Conformation The Helix and Pleated Sheet Conformationally allowable structures where backbone is optimally Hbonded (linear Hbonds). Helix (3.613 Helix): •3.6 residues/turn •Rise = 0.15 nm/ residue •13-atom hydrogenbonded loop Linus Pauling and Robert Corey‚ 1950 Pleated Sheet: •Anti-parallel or parallel •2.0 residues/”turn” •0.34 nm/residue (anti-parallel) or 0.32 nm/residue
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Abstract In this experiment‚ 4-(4-chlorophenyl)-3‚4-dihydropyrimidine-2-one is synthesized in a solvent-free reaction‚ where urea‚ ethyl acetoacetate‚ 4-chlorobenzaldehyde are used as the reactants and p-toluenesulfonic acid is used as the catalyst. This reaction is similar to the original synthesis of DHPM by Pietro Bignelli‚ as it incorporates a single step. Due to its environmentally friendly conditions‚ such as the use of solar energy as a heat source and the lack of solvent‚ this synthesis of
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results do indicate the desired hydroxyketone was formed. Introduction: The purpose of this multi-step lab was to synthesize 4-hydroxy-4‚4-diphenylbutan-2-one from ethyl acetoacetate. The Grignard reaction is widely used to react with ketones and aldehydes to give alcohols‚ however‚ it cannot selectively retained carbonyl groups already present in a structure.1‚2
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electrons are involved in each covalent bond? a) 1 b) 2 c) 4 d) 6 e) 8 6. An amino acid always has an amino group‚ as its name suggests. What other group is also present in all amino acids? a) a methyl group b) a carboxyl group c) an aldehyde group d) a hydroxyl group e) a carbonyl group 7. The following structural formula is representative of which functional group? a) sulfhydryl b) carboxyl c) hydroxyl d) amino e) carbonyl 8. The following structural formula is representative
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