Marta Gebregziabher Discussion and Conclusion: Addition reaction of Alkenes: Bromination of (E)-Stilbene 1. Addition reaction is a reaction that involved two molecules that combine to make a larger product. Addition reaction has two main types‚ electrophilic addition and nucleophilic addition. An electrophilic reaction is when the pi bond of a molecule is removed to make two covalent bonds that are bonded to two new molecules. A nucleophillic addition is a reaction that removed the pi bond
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Experiment 23: Synthesis of an Alkene April 5‚ 2013 Purpose: Results and Discussion The weight of our n-Butyl Bromide sample (actual yield) was 0.09g. The percent yield was found to be 4.38%. Only 0.09g of the theoretical 2.055g yield was obtained. The boiling point was 104° C‚ which is higher than the literature value of 101° C. This is due to the sample being somewhat impure‚ as impurities tend to increase boiling point. When IR spectroscopy was performed‚ there were no OH stretches
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Cyclic dienes added to alkene dienophiles also lead to two new form of stereoisomeric products‚ the endo and exo products (Kilway‚ “Lecture”). In cases where dienes and dienophiles align above one another‚ the endo product is formed (Hunt). The endo product will have two axial substituent groups (Kilway‚ “Lecture”). This formation typically forms the major product because it takes less kinetic energy to be formed due to secondary orbital interactions with the substituents in transition states (Hunt)
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molecular formula of alkynes is CnH2n–2 • Triple bonded carbons are ‘sp’ hybridized and greater s – character is associated with it. • Alkynes will exhibit chain‚ position and functional isomerism. • Their functional isomers are alkadienes and cyclo alkenes. • The minimum number of carbons required to exhibit chain isomerism by an alkyne is five. Preparation of Acetylene or ethyne : 1. Industrial method : By the hydrolysis of calcium carbide CaC2 + 2H2O → HC ≡ CH + Ca(OH)2 C C H − OH H − OH C −H C
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alkane at 500°C; Cracking of Alkanes | Al2 O3 is used as a catalyst. Heat provides energy for breakage of C-C bonds. | UV light; Initiation step of FRS of alkanes by halogens * Not required for electrophilic addition reaction btw Halogens and alkenes | Br-Br 2Br Provides the energy for homolytic fission of Br-Br bond. Visible and infra-red radiations are unable to break covalent bonds while UV light can‚ because one quantum of UV light has sufficient energy (396 kJmol-1) to break the typical
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Mapua Institute of Technology; 2Student (s)‚ Subject/Section‚ School of Chemical Engineering‚ Chemistry and Biotechnology‚ Mapua Institute of Technology ABSTRACT Hydrocarbons are compounds that only contain carbon and oxygen atoms. Alkanes‚ alkenes‚ alkynes and aromatic rings are the four classifications of hydrocarbons. Each of these classifications have different physical and chemical properties that were tested as this experiment was performed. Flammability test and solubility test were done
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* Introduction to Organic Chemistry Understand the basis of drawing organic structures Depicting 3-D structures in 2-D Most organic compounds have a three-dimensional structure. How do we represent structures on our two-dimensional page? For example‚ methane is a tetrahedral molecule: Bonds in the plane of the paper: Bonds coming towards the observer: (out of the page) Bonds going away
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clear liquid. After adding 3 drops red color Br2/CH2Cl 2 the solution turned orange. Orange color held. Alkene Alkene used was pentene. Originally clear liquid. After addition‚ solution turned yellowish at first but then turned clear after a few minutes of sitting. Alkyne Alkyne used was toluene. Originally clear liquid. After addition‚ solution turned orange. Orange maintained longer than alkene but eventually turned clear. Unknown Originally clear liquid. After addition of unknown‚ turned orange
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Physical properties of organic compound Low boiling point group: alkane‚ alkene‚ alkyne and ether Boiling point is the exact temperature that the state of compound change from liquid to gas‚ which need to break the intermolecular forces. The stronger the intermolecular forces‚ the higher the boiling point. Since straight chain alkane‚ alkene and alkyne only experience dispersion forces‚ the compound with more carbons have higher boiling point as more carbons contribute more forces. Branched
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Dehydration of an alcohol • Preparation of an alkene • Distillation • Unsaturation tests THEORY An acid-catalyzed dehydration is a common way to synthesize an alkene from an alcohol. Use of a strong acid like sulfuric or phosphoric acid serves to protonate the alcohol "OH" group‚ forming an H2O molecule that is a much better leaving group. As the water leaves the starting material‚ a proton is also lost in an elimination process. The end result is the alkene product. The chemical equation that describes
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