Preparation u Alcohols when heated in presence of H2SO4‚ H3PO4‚ P2O5‚ Al2O3 or BF3 undergo loss of water molecule with the formation of alkene. Conc. H2SO4 180oC H3PO4/P2O5 200oC Al2O3/BF3 350oC CH3-CH=CH2 + H2O CH3-CH2-CH2-OH CH3-CH=CH2 + H2O CH3-CH=CH2 + H2O u u Mechanism: In the first step OH group of the alcohol is protonated in a fast reversible reaction. Unlike OH group‚ protonated OH group is a good leaving group. Step 1: CH3 CH3-C-CH3 + H+ HO CH3 CH3-C-CH3 H2O+
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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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near the monomer with one thiolane. The mono with one thiolane gets deprotonated and continues the chain. This cannot work without heat. Chlorine itself is not a strong enough base for deprotonation. However‚ chlorine is a good leaving group‚ so a Sn2 or Sn1 mechanism can work. The chlorine leaving thus creates a carbocation‚ but the carbocation can have resonance stability. These
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CHEMISTRY (Theory) Time allowed : 3 hours General Instructions: (i) All questions are compulsory. Maximum Marks : 70 (ii) Marks for each question are indicated against it. (iii) Question numbers 1 to 8 are very short-answer questions and carry 1 mark each. (iv) Question numbers 9 to 18 are short-answer questions and carry 2 marks each. (v) Question numbers 19 to 27 are also short-answer questions and carry 3 marks each. (vi) Question numbers 28 to 30 are long-answer questions and carry 5 marks
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3-dimethyl-cyclohexane E. S-3-ethyl-R-6-S-6-dimethyl-cyclohexanol HO M. Predict the most likely mechanism(s) for the reaction of cis-3-methyl-chloro-cyclohexane with sodium methoxide (in methanol as the solvent) – circle one option. A. SN2 B. C. D. E. E1 SN1 E2 E2 and SN2 N. With which reagent is cis-2-methyl-cyclopentanol most likely to undergo rearrangement? A. NaOH in protic solvent B. C. D. E. water Concentrated H2SO4 KOC(CH3)3 in aprotic solvent NaNH2 in aprotic solvent Chem. 121 Final
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CHEM 2325 Organic Chemistry II Handout #1A – Alcohols 1) What type of orbital do the lone pair electrons on oxygen occupy in ethanol? A) σ B) π C) p D) sp E) sp3 2) Provide the structure of the major organic product in the reaction below. 3) Provide the structure of the major organic product in the reaction below. 4) Provide the structure of the major organic product in the reaction below. 5) Provide the structure of the major organic product in the reaction
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Title: Prep of t-Butyl Chloride via SN1 Reaction Purpose: The purpose of this experiment is to synthesize tert-butyl chloride via an SN1 reaction. t-Butyl Chloride was synthesized from t-Butyl Alcohol using hydrochloric acid in separatory funnel; isolation of t-Butyl Chloride was done under distillation conditions. The experiment resulted in 8.29grams of purified compound‚ which is a 66.27 percent yield. Procedure: As per handout with changes Equation: Mechanism: Results: (Scan
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Experiment 2 Title: preparation of a halogenoalkane Objective: To synthesis 2-cholo-2-methylpropane by using corresponding alcohol and HCl(aq). The reaction is via SN1 of tertiary alcohol. Techniques: i) Distillation of the reactant and the product ii) Purification by separating funnel Theory: In the experiment‚ SN1 reaction take place‚ HCl is added to initiate the reaction. The R-OH attack the H+ with the lone pair on O. Then the R-O+H2 bond breaks the release a water molecule and
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halides under acidic conditions and record the 13C NMR spectrum in each case. The reaction that takes place in the conversion is a bimolecular nucleophilic substitution‚ or SN2 reaction. Alcohols do not undergo the same SN2 reactions commonly observed with alkyl halides. There are four aspects that determine the rate of the SN2 reaction: nucleophile‚ substrate‚ solvent and the leaving group. This reaction requires a lone pair from a nucleophile to donate an electron-pair in the formation of a chemical
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PHARMACY MANAGEMENT SYSTEM BY IBITOYE AHMAD ADEWALE REG.NO: 08283006 SUBMITTED TO THE DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE UNIVERSITY OF ABUJA FCT-ABUJA‚ NIGERIA IN PARTIAL FULFILMENT FOR THE REQUIREMENTS OF THE AWARD OF BACHELOR OF SCIENCE DEGREE (B.SC) IN COMPUTER SCIENCE APRIL‚ 2013 CERTIFICATION This is to certify that this research work was carried out by IBITOYE AHMAD ADEWALE with registration number 08283006 of the Department of COMPUTER SCIENCE under the supervision of
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