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Chapter 4: Problem 40
Iodobenzene when heated with Cu powder gives (a) toluene (b) benzene (c) diphenyl (d) phenyl copper iodide
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The best reagent to replace alcoholic, phenolic or carboxylic -OH groups with -Cl is (a) \(\mathrm{PCl}_{5}\) (b) \(\mathrm{SOCl}_{2}\) (c) \(\mathrm{PCl}_{3}\) (d) anhy.ZnCl and conc.HCl
Preparation and reactions of alcohols Alcohols can by prepared from alkyl halides, epoxides, alkenes, etc. When treated with acid, \(\mathrm{C}-\mathrm{OH}\) bond is cleaved heterolytically to form a carbocation which could then undergo substitution, elimination or rearrangement depending on the conditions and stability of the carbocation. When 1,2 -dimethyl cyclohexene is treated with cold dilute alkaline \(\mathrm{KMnO}_{4}\), the product obtained is
Which of the following statement is not correct regarding the solvolysis of 3 -bromo-3-methylhexane? (a) Polar solvents accelerate the reaction. (b) The intermediate involves \(\mathrm{sp}^{2}\) carbon. (c) The rate of the reaction at a particular temperature depends only on the concentration of \(3-\) Bromo- \(3-\) methyl hexane. (d) The reaction involves inversion of configuration.
Preparation and reactions of alcohols Alcohols can by prepared from alkyl halides, epoxides, alkenes, etc. When treated with acid, \(\mathrm{C}-\mathrm{OH}\) bond is cleaved heterolytically to form a carbocation which could then undergo substitution, elimination or rearrangement depending on the conditions and stability of the carbocation. When \(\mathrm{BrCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}\) is refluxed with metallic sodium in dry ethers the major product obtained is (a) \(\mathrm{BrCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{ONa}\) (b) \(\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}\)
In which of the following reaction, ethanol acts as a base? (a) Reaction with metallic sodium (b) Reaction with Grignard reagent (c) Acid catalysed dehydration (d) Reaction with hot copper catalyst
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