These are the important Questions asked from Surface Chemistry Chapter in JKBOSE Class 12th Class Examination
Note: Only Short & very short answer (sometimes) type Questions are asked from this chapter
Q2. How is methyl amine prepared from Hoffmann's Bromamide reaction with Gignard's reagent?
Q3. How aniline is prepared from Chlorobenzene? Give its reaction with Benzoylchloride?
Q4. How Amines are classified?
Q5. Why Amines are basic?
Q6. Discuss carbylamine reaction?
Q7. What are Nitriles and isonitriles? Give one method of preparation of nitriles?
Q8. Discuss Hoffmann bromamide reaction?
Q9. Write how aniline is prepared from Nitrobenzene?
Q10. Give reaction of Analine with Bromine?
Q11. Explain the basic nature of Amines?
Q12. Why are amines less acidic than alcohols of comparable molecular masses?
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Q13. Why do primary amines have higher boiling point than tertiary amines?
Q14. Why are aliphatic amines stronger bases than aromatic amines?
Q15. Why cannot aromatic primary amines be prepared by Gabriel phthalimide
synthesis?
Q16. Write short notes on the following:
(i) Carbylamine reaction
(ii) Diazotisation
(iii) Hofmann’s bromamide reaction
(iv) Coupling reaction
(v) Ammonolysis
(vi) Acetylation
(vii) Gabriel phthalimide synthesis.
Q17.Accomplish the following conversions:
(i) Nitrobenzene to benzoic acid
(ii) Benzene to m-bromophenol
(iii) Benzoic acid to aniline
(iv) Aniline to 2,4,6-tribromofluorobenzene
(v) Benzyl chloride to 2-phenylethanamine
(vi) Chlorobenzene to p-chloroaniline
(vii) Aniline to p-bromoaniline
(viii) Benzamide to toluene
(ix) Aniline to benzyl alcohol.
Q18. Give one chemical test to distinguish between the following pairs of compounds.
(i) Methylamine and dimethylamine
(ii) Secondary and tertiary amines
(iii) Ethylamine and aniline
(iv) Aniline and benzylamine
(v) Aniline and N-methylaniline.
Q19. Account for the following:
(i) pKb of aniline is more than that of methylamine.
(ii) Ethylamine is soluble in water whereas aniline is not.
(iii) Methylamine in water reacts with ferric chloride to precipitate hydrated
ferric oxide.
(iv) Although amino group is o– and p– directing in aromatic electrophilic
substitution reactions, aniline on nitration gives a substantial amount of m- nitroaniline.
(v) Aniline does not undergo Friedel-Crafts reaction.
(vi) Diazonium salts of aromatic amines are more stable than those of aliphatic
amines.
(vii) Gabriel phthalimide synthesis is preferred for synthesising primary amines.
Q20. How will you convert:
(i) Ethanoic acid into methanamine
(ii) Hexanenitrile into 1-aminopentane
(iii) Methanol to ethanoic acid
(iv) Ethanamine into methanamine
(v) Ethanoic acid into propanoic acid
(vi) Methanamine into ethanamine
(vii) Nitromethane into dimethylamine
(viii) Propanoic acid into ethanoic acid?
Q21. Describe a method for the identification of primary, secondary and tertiary amines. Also write chemical equations of the reactions involved.
Q22. Give the reaction of Ethyl Amine with:
(i) Grignard's reagent
(ii) Carbon disulphide
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