Why are 2-nitrobenzoic acid and 2-chlorobenzoic acid stronger acids than benzoic acid? Aromatic Side-Chain Oxidation: o-Chlorobenzoic Acid from o-Chlorotoluene
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Why are 2-nitrobenzoic acid and 2-chlorobenzoic acid stronger acids than benzoic acid?
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- Give reasons :(a) n-Butyl bromide has higher boiling point than f-butyl bromide.(b) Racemic mixture is optically inactive.(c) The presence of nitro group (-NO2) at o/p positions increases the reactivity of haloarenes towards nucleophilic substitution reactions.Wittig reactions with the following -chloroethers can be used for the synthesis of aldehydes and ketones. (a) Draw the structure of the triphenylphosphonium salt and Wittig reagent formed from each chloroether. (b) Draw the structural formula of the product formed by treating each Wittig reagent with cyclopentanone. Note that the functional group is an enol ether or, alternatively, a vinyl ether. (c) Draw the structural formula of the product formed on acid-catalyzed hydrolysis of each enol ether from part (b).When warmed in dilute sulfuric acid, 1-phenyl-1,2-propanediol undergoes dehydration and rearrangement to give 2-phenylpropanal. (a) Propose a mechanism for this example of a pinacol rearrangement (Section 10.7). (b) Account for the fact that 2-phenylpropanal is formed rather than its constitutional isomer, 1-phenyl-1-propanone.
- Why are 2-nitrobenzoic acid and 2-chlorobenzoic acid stronger acids than benzoic acid?Explain why the treatment of anisole with HBr yields phenol and CH3Br, but not bromobenzene.An unknown hydrocarbon A with the formula C6H10 reacts with 1 molar equivalent of H2 over a palladium catalyst to give B C6H12 (Rxn 1). Hydrocarbon A also reacts with OsO4 to give the glycol C (Rxn 2). A gives 5-oxohexanal on ozonolysis (Rxn 3). Draw the structures of A, B, and C. Give the reactions.
- What factor seems to be responsible for the Wagner-Meerwein rearrangement of camphene to give isobornyl acetate (a 3º → 2º carbocation rearrangement)?Why are H3PO4 and H2SO4 used in the synthesis of 4-methylcyclohexene from 4-methylcyclohexanol and not HBr or HCl?(a) Arrange the following compounds in an increasing order of their indicated property :(i) Benzoic acid, 4-Nitrobenzoic acid, 3,4-Dinitrobenzoic acid, 4-Methoxybenzoic acid (acid strength)(ii) CH3CH2CH (Br) COOH, CH3CH (Br) CH2COOH,(CH3)2CHCOOH, CH3CH2CH2COOH (acid strength)(b) How would you bring about the following conversions :(i) Propanone to Propene (ii) Benzoic acid to Benzaldehyde(iii) Bromobenzene to 1-phenylethanol
- Write reactions of aniline with the following reagents: a. CH3COCl b. Br2 c. CH3IExplain this statement: Although 2-methoxyacetic acid (CH3OCH2COOH) is a stronger acid than acetic acid (CH3COOH), p-methoxybenzoic acid (CH3OC6H4COOH) is a weaker acid than benzoic acid (C6H5COOH).Use the four compounds shown below to answer the following questions: a. Why are the ortho-halo-substituted benzoic acids stronger acids than benzoic acid? b. Why is o-fluorobenzoic acid the weakest of the ortho-halo-substituted benzoic acids? c. Why do o-chlorobenzoic acid and o-bromobenzoic acid have similar pKa values?