g/mol bp 60 °C mp 133-134 °C mp 93-95 °C mp 202-204 °C When an electrophile‚ such as bromine‚ adds to an alkene‚ the addition can be done in a syn fashion‚ in which the two groups add to the same side of the molecule‚ or in an anti fashion‚ in which the groups add to opposite sides of the molecule. Depending on the mode of addition‚ syn or anti‚ and the stereochemistry of the starting alkene‚ various stereoisomers will result. In some cases‚ a racemic mixture of products is formed‚ other times
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hydrocarbons‚ there are a number of bands that appear in the spectra of such compounds as there is a wide range of structures possible. The main infrared bands for alkanes are summarized in Table 4.1. Table 4.1 Characteristic infrared bands of aliphatic hydrocarbons Wavenumber (cm−1 ) Assignment 2960 2930 2870 2850 1470 1465 1380 1305 1300 720 Alkanes Methyl symmetric C–H stretching Methylene asymmetric C–H stretching Methyl asymmetric C–H stretching Methylene symmetric C–H stretching Methyl asymmetrical
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I. Abstract The experiment: Classification tests on Organic Compounds‚ allows the students to be familiarized with different classification tests used for identifying the different classes of organic compounds; examine unknown compounds using appropriate tests; and identify functional group of an organic compound based on the tests performed. Several organic compounds with different functional groups were tested to identify the functional groups present in the compound. n-heptane‚ pentene
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Semester: fall 2011 Practice to Chapter 12 (Alkenes & Alkynes *1. Consider the following: CH3CH2CH=CHCH2CH3 CH3CH2CH2CH2CH=CH2 I II CH3CH=CHCH2CH2CH3 CH2=CHCH2CH2CH2CH3 III IV Which two structures represent the same compound? A) I and II B) II and III C) I and III D) II and IV E) None of these *2. Give the IUPAC name for A) 3-Methyl-4-hexyne B) 4-Methyl-2-hexyne C) 2-Ethyl-3-pentyne D) 4-Ethyl-2-pentyne E)
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be analyzed using gas chromatography. This experiment was performed to show how a radical hydrogenation reaction works with alkanes. Four isomers were attained and then relative reactivity rate was calculated. 1‚1-dichlorobutane had 2.5% per Hydrogen; 1‚2-dichlorobutane had 10%; 1‚3-dichlorobutane had 23%; and 1‚4-dichlorobutane had 9.34% per Hydrogen. Introduction Alkanes are relatively unreactive. There are only a few types of reactions commonly performed. In this lab‚ halogenation was performed
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Surname Centre No. Initial(s) Paper Reference 4 3 3 5 Candidate No. 2 H Signature Paper Reference(s) 4335/2H Examiner’s use only London Examinations IGCSE Team Leader’s use only Chemistry Paper 2H Higher Tier Wednesday 17 June 2009 – Morning Time: 2 hours Materials required for examination Nil Items included with question papers Nil Question Leave Number Blank 1 2 3 4 5 6 7 8 9 Instructions to Candidates In the boxes above‚ write your centre number‚ candidate number‚ your surname
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Combustion of Acetylene (ethyne) Rx: Back Why I don’t do acetlyene explosions in our lab.... Combustion of alkanes A quick review.... • Combustion reactions of alkanes consist only of C and H (hydrocarbon) • require O2(g) as a reactant • produce CO2(g) and H2O(g) and a large amount of energy!! Oxygen can be the limiting reagent which can lead to Incomplete combustion. For complete combustion of a hydrocarbon‚ oxygen must be in excess. If there isn’t sufficient oxygen‚ incomplete combustion occurs
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immediately reveals a different arrangement of atoms for these substances. Compounds that have the same molecular formula but different structural formulas are termed isomers. In this lab exercise‚ you will determine the different isomers for various alkane
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oxygen is electron rich and both carbon and hydrogen are electrophilic‚ as shown in the drawing on the right. Indeed‚ the dipolar nature of the O–H bond is such that alcohols are much stronger acids than alkanes (by roughly 1030 times)‚ and nearly that much stronger than ethers (oxygen substituted alkanes that do
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2.5. Characterization Methods 1H–NMR and 13C–NMR spectra of HPPP‚ BOMP and HVPA were taken in CDCl3 on Bruker DPX–300 MHz spectrometer using tetramethylsilane (TMS) as an internal standard. FT–IR spectra of the synthesized compounds‚ HPPP‚ BOMP‚ HVPA and photocrosslinked polymers were recorded on Perkin-Elmer system 2000 (4000–400 cm–1) spectrometer‚ using KBr pellets. Medium pressure mercury vapour lamp to the power output of 125W/cm2 was used for the photocrosslinking study. The viscosity of the
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