(a)
Interpretation:
The synthesis of cis isomer from given
Concept introduction:
The
(b)
Interpretation:
The synthesis of trans isomer from given alkyl halide and any other organic compound is to be stated.
Concept introduction:
The alkynes consist of a triple bond between two carbon atoms. The general formula of alkynes is
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Organic Chemistry
- 11:43 Q1. (a) (c) (d) (b) Two stereoisomers of but-2-ene are formed when 2-bromobutane reacts with ethanolic potassium hydroxide. (i) Explain what is meant by the term stereoisomers. Library Name and outline a mechanism for the reaction of 2-bromo-2-methylpropane with ethanolic potassium hydroxide to form the alkene 2-methylpropene, (CH3)2C=CH₂ Name of mechanism Mechanism (ii) Draw the structures and give the names of the two stereoisomers of but-2-ene. Stereoisomer 1 Name (iii) Name this type of stereoisomerism. Select Name Stereoisomer 2 When 2-bromo-2-methylpropane reacts with aqueous potassium hydroxide, 2-methylpropan-2-ol is formed as shown by the following equation. CH3 H₂C-C-CH3 + KOH Br Page 2 of 14 CH3 H3C-C-CH3 + KBr ОН State the role of the hydroxide ions in this reaction. Write an equation for the reaction that occurs when CH3CH₂CH₂CH₂Br reacts with an excess of ammonia. Name the organic product of this reaction. Equation Name of product 9,284 Photos, 1,166 Videos For You…arrow_forwardThe hydrocarbon fluorene was treated with potassium t-butoxide in an acid-base reaction, giving the fluorenide anion and t-butyl alcohol. (a) Which way does the equilibrium lie, and by how much? b) What is the proportion of the fluorenide anion to fluorene? (c) Why is fluorene so highly acidic, considering the pKa of an average alkane is above 50?arrow_forward(i) Name, draw and describe the organic product of the reaction between 2-methylbut-1-ene and H2O in the presence of H2SO4 and provide a clear rationale as to why this is the major product of the reaction. (ii) The elimination reaction between 2-bromobutane and NaOCH2CH3 gives two organic products. Draw a mechanism for the reaction which produces the major organic elimination product and provide a rationale as to why that is the major product.arrow_forward
- (a) Explain the mechanism of a nucleophilic attack on the carbonyl group of an aldehyde or a ketone.(b) An organic compound (A) (molecular formula CgH16Q2) was hydrolysed with dilute sulphuric acid to give a carboxylic acid (B) and an alcohol (C). Oxidation of (C) with chromic acid also produced (B). On dehydration (C) gives but-1-ene. Write the equations for the reactions involved.arrow_forward(a) Although phenoxide ion has more number of resonating structures than carboxylate ion, carboxylic acid is a stronger acid than phenol. Give two reasons.(b) How will you bring about the following converstions?(i) Propanone to propane (ii) Benzoyl chloride to benzaldehyde(iii) Ethanal to but-2-enalarrow_forward(a) How will you obtain the following :(i) Benzaldehyde from Phenol (ii) Benzoic acid from Aniline(b) Give reasons :(i) Aldehydes are more reactive than ketones towards nucleophilic reagents.(ii) Electrophilic substitution in benzoic acid takes place at meta position.(iii) Carboxylic acids do not give the characteristic reactions of carbonyl group.arrow_forward
- (a) The Friedel-Crafts reaction of benzene with 2-chloro-3-methylbutane in the presence of AlCl3 occurs with a carbocation rearrangement. Give mechanistic explanation and the product formed. (b) Predict the product(s) will be formed from the following reactions: (i) Bromination of p-methylbenzoic acid (ii) Sulphonation of m-bromoanisole (iii) Friedel-craft acylation of o-bromonitrobenzenearrow_forwardFuran undergoes electrophilic aromatic substitution more readily than benzene; mild reagents and conditions are sufficient.For example, furan reacts with bromine to give 2-bromofuran.(a) Propose mechanisms for the bromination of furan at the 2-position and at the 3-position. Draw the resonance forms ofeach sigma complex, and compare their stabilities.(b) Explain why furan undergoes bromination (and other electrophilic aromatic substitutions) primarily at the 2-position.O Br O123furan 2-bromofuranarrow_forward(a) Propose a mechanism for the conversion of cis-hex-3-ene to the epoxide (3,4-epoxyhexane)and the ring-opening reaction to give the glycol, hexane-3,4-diol. In your mechanism, payparticular attention to the stereochemistry of the intermediates and products.(b) Repeat part (a) for trans-hex-3-ene. Compare the products obtained from cis- andtrans-hex-3-ene. Is this reaction sequence stereospecific?arrow_forward
- Provide the reagents and solvents (where appropriate) needed to bring about the following transformations. (a) CI (b)arrow_forward(b) Propose a synthesis of (2,2-dimethylpropyl)benzene from benzene.arrow_forwardElucidate the structure, hybridization, stability order and factors affecting the stability of an organic intermediate which is formed by the homolytic bond breaking.arrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning