![]() ![]() Give the equations of the reaction for the preparation of phenol from cumene.Īns: This process has a great industrial importance because it gives the preparation of two very useful compounds i.e. Give reason.Īns:0-N itrophenol is steam volatile due to chelation (intramolecular H – bonding) and hence can be separated by steam distillation from/Miitrophenol which is hot steam volatile because of intermolecular H-bonding.ġ1.9. While separating a mixture of ortho and para nitrophenols by steam distillation, name the isomer which will be steam volatile. Give the structures and IUPAC names of monohydric phenols of molecular formula, C 7H 8O.ġ1.8. What is meant by hydroboration-oxidation reaction? Illustrate it with an example.Īns:The addition of diborane to alkenes to form trialkyl boranes followed by their oxidation with alkaline hydrogen peroxide to form alcohols is called hydroboration-oxidation. On die other hand, hydrocarbons cannot from hydrogen bonds with water and hence are insoluble in water.ġ1.6. ![]() Explain this fact.Īns:Alcohols can form hydrogen bonds with water and by breaking the hydrogen bonds already existing between water molecules. Alcohols are comparatively more soluble in water than hydrocarbons of comparable molecular masses. Explain why propanol has higher boiling point than that of the hydrocarbon, butane?Īns: The molecules of butane are held together by weak van der Waal’s forces of attraction while those of propanol are held together by stronger intermolecular hydrogen bonding.ġ1.5. (a) The molecular formula C 5H 120 represents eight isomeric alkanols. (b) Classify the isomers of alcohols given in part (a) as primary, secondary and tertiary alcohols. (a) Draw the structural formulas and write IUPAC names of all the isomeric alkanols with the molecular formula C sH 12 O Write structures of the compounds whose IUPAC names are as follows:ġ1. Write IUPAC names of the following compounds:ġ1.2. Predict the products of the following reactions:ġ1.1. Which of the following is an appropriate set of reactants for the preparation of l-methoxy-4- nitrobenzene and why?ġ1.12. Thus, the alkyl halide should be derived from ethanol and the alkoxide ion from 3-methylpentan-2-ol. Write the reactions of Williamson synthesis of 2-ethoxy-3-methylpentane starting from ethanol and 3-methylpentan-2-ol.Īns: In Williamsons’s synthesis, the alkyl halide should be primary. The resonance structures of o-and p- nitrophenoxide ions and phenoxide ion are given below:ġ1.9 Write the equations involved in the following reactions:ġ1.10. Draw the resonance structures of the corresponding phenoxide ions. Ortho and para nitrophenols are more acidic than phenol. Predict the major product of acid catalysed dehydration ofġ1.8. Give structures of the products you would expect when each of the following alcohol reacts with (a)HCl-ZnCl 2 (b)HBrand (c) SOCl 2ġ1.7. Write structures of the products of the following reactions:ġ1.6. Show how are the following alcohols prepared by the reaction of a suitable Grignard reagent on methanal ?ġ1.5. Name the following compounds according to IUPAC system.ġ1.4. Identify aliylic alcohols in the above examples.Īns: (ii) and (iv) i.e. Classify the following as primary, secondary and tertiary alcohols.ġ1.2. NCERT Solutions CBSE Sample Papers Chemistry Class 12 Chemistryġ1.1. ![]() Topics and Subtopics in NCERT Solutions for Class 12 Chemistry Chapter 11 Alcohols Phenols and Ether : Section Name NCERT Solutions For Class 12 Chemistry Chapter 11 Alcohols Phenols and Ether
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