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4.4 Show how the compound thiodiazine - C21H26N2S2 - decomposes anaerobically and how these end products in turn decompose aerobically to stabilized sulfur
and nitrogen compounds.
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- (5) (6) (7) Outline a synthesis pathway for the formation of the following alcohol derivatives from the different alkene substrates OH (a) CH3 (b) OH Formulate mechanism for the following reaction and name the product according to IUPAC: CH3OH CH3CH₂ OH H₂SO4 What is the major product formed in each of the following reactions: (a) Br₂ heat (b) [TURN OVER]1. (a) Compound A,B and C are isomers with molecular formula of C4H8O. When compound A,B and C reacts with 2,4-dinirophenylhydrazine, a yellow precipitate is formed. Compound B and C show a positive result with silver nitrate in aqueous ammonia. (i) Deduce the structures of A,B and C. (ii) Give the observation when A and B reacts with silver nitrate in aqueous ammonia.(b) Suggest a reasonable biosynthesis for the naturally occurring alkaloid coniine (isolated from hemlock), starting from octanoic acid. Coniine
- (a) Aniline is oxidized and then resulting product is boiled with Conc. HNO3 and conc. H2S04. (b) Cyclopentylnitrile is reduced with LIAIH4 and the resulting product reacts with benzenesulphonylchloride (c) 2-Chloro-5-methyl-diethylhexandioate is condensed in alkaline medium (d) 2-Methylethylpropanoate is condensed with phenylbenzanoate in an alkaline medium (e) When Ethanoic is heated with NH3 and resulting product reacts with benzoylchloride.(c) Arrange the following compounds in order of increasing acidity, and explain the reasons fo your choice of order: phenol, cyclohexanol, 2-fluorocyclohexanol, 2-fluoronhenol(a) Write the structures of main products when benzene diazonium chloride reacts with the following reagents :(i) H3PO2 + H2O (ii) CuCN/KCN (iii) H2O(b) Arrange the following in the increasing order of their basic character in an aqueous solution :C2H5NH2, (C2H5)2NH, (C3H5)3N(c) Give a simple chemical test to distinguish between the following pair of compounds :C6H5—NH2 and C6H5—NH—CH3
- 7B. (2 reactions (should clearly indicate the stereochemistry). Draw the structure of the product, substrate or condition in the following (a) ОН (b) Ме 1) OsO4 2) NaHSO3 (c) 1) (sia)2BH 2) NaOH/H2O2 H20(b) Describe the hazards of (i) trioxygen: (ii) hydroxide ion; (ii) hydrogen sulfide. (c) Explain why an aqueous solution of sodium sulfide has an odor of hydrogen sulfide. (d) (11) Reduction of H,CCHCHO with NABH4 gives a product different from that of catalytic hydrogenation (H2 /Ni). What are the products?(a) Propose a reasonable synthesis for the formation of nonane from CH3CH2CH2I and any other organic/inorganic reagent. (b) Suggest three (3) different Grignard reactions leading to 2-phenyl-2-butanol.
- Explain the following behaviours :(i) Alcohols are more soluble in water than the hydrocarbons of comparable molecular masses.(ii) Ortho-nitrophenol is more acidic than ortho-methoxyphenol.(10pts) Compound A, C10H16, was found to be optically active. On catalytic reduction over a palladium catalyst, 2 equivalents of hydrogen were absorbed, yielding compound B, CioH2o. On ozonolysis of A, two fragments were obtained. One fragment was identified as acetic acid (CHCOOH). The other fragment, compound C, was an optically active carboxylic acid, C8H14O2. Write reactions, and draw the correct structures for A-C, explain your answer in detail.8.1)The enol content of CH3COCH2CO2Et in hexane is 46% and that in water is 0.4%. Thereason for the above observation is as follows: (A) Intermolecular hydrogen bonding is stabilized by hexane. (B) Intramolecular hydrogen bonding is stabilized by water. (C) Intramolecular hydrogen bonding is destabilized by water. (D) CH3COCH2CO2Et dissolves in hexane completely. 2)The molecular formula of glucose is C6H12O6. The chemical composition of glucose is(A) 39.99 % C, 6.71 % H, 53.27 % O (B) 40.99 % C, 6.71 % H, 53.27 % O(C) 39.99 % C, 7.71 % H, 54.27 % O (D) 29.99 % C, 7.71 % H, 53.00 % O 3)20 mL of 0.2 M hydrochloric acid is added to 5 mL of 0.1 M sodium carbonate. Theresultant solution is then titrated against 0.2 M sodium hydroxide. What will be the titrevalue?(A) 15 mL (B) 10 mL (C) 5 mL (D) 20 mL 4) High thermal stabilities of transition metal carbonyls are due to- (A) non-availability of d-orbital on carbon. (B) formation of an ionic bond between CO and metal. (C) interaction of…