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The compound WH2(C5H5)2 acts as a base, but TaH3(C5H5)2
does not. Explain.
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- a) If the pH value of an aqueous solution of trimethylamine [(CH3) 3N] is 10.75, what should be the molarity of this solution? (CH3) 3N + H2O ↔ (CH3) 3NH + + OH-, Kb = 6.3 × 10-5 b) What will be the pH of the solution prepared by dissolving 8.35 g of aniline hydrochloride (C6H5NH3 + Cl-) in 750 mL of 0.215 M aniline (C6H5NH2)? Is this solution an effective buffer? Explain (Kb = 7.4 × 10-10 for aniline, C: 12.0 g / mol, H: 1.0 g / mol, N: 14.0 g / mol, Cl: 35.4 g / mol) .a) If the pH value of an aqueous solution of trimethylamine [(CH3)3N] is 10.75, what should be the molarity of this solution? (CH3)3N + H2O ↔ (CH3)3NH+ + OH-, Kb = 6,3 × 10-5 b) What will be the pH of the solution prepared by dissolving 8.35 g of aniline hydrochloride (C6H5NH3+Cl-) in 750 mL of 0.215 M aniline (C6H5NH2)? Is this solution an effective buffer? Explain (Kb = 7,4 × 10-10 for aniline, C: 12.0 g / mol, H: 1.0 g / mol, N: 14.0 g / mol, Cl: 35.4 g / mol) .Draw the complete Lewis structure of (CH3)2CHCH(NH2)CO2H and identify all H-bond donors and all H-bond acceptors.
- Write the basic equilibrium equation for (CH₃)₂NH.Formaldehyde, H2C=O, is known to all biologists because of its usefulness as a tissue preservative. When pure, formaldehyde trimerizes to give trioxane, C3H6O3, which, surprisingly enough, has no carbonyl groups. Only one monobromo derivative (C3H5BrO3) of trioxane is possible. Propose a structure for trioxane.from each. a) b) c) Predict the product of the following reactions. Provide the major organic product Br Br Br →→ Li CN acetone Na₂S
- Write the structures of the following organic halogen compounds :(i) 4-tert-Butyl-3-iodoheptane(ii) 4-Bromo-3-methylpent-2-ene(a) 1) Br₂, H3O+ 2) pyridine, 80°CArrange the following compounds in increasing order of their property as indicated :(i) CH3COCH3, C6H5COCH3, CH3CHO(reactivity towards nucleophilic addition reaction)(ii) Cl—CH2—COOH, F—CH2—COOH, CH3—COOH (acidic character)
- 1: In the sweetening MEROX process for kerosene the mercaptans are converted into (a) Sulpher (b) Disulphide (c) Hydrogen sulphide (d) None of these 2: Which of the following products contain maximum sulphur? (a) Diesel fuel (b) Fuel oil (c) Jet fuel (d) LPG 3: Which of the following petroleum product has a maximum C/H ratio (by weight)? (a) Light diesel oil (b) Fuel oil (c) Naphtha (d) Heating oil 4: Which of the following hydrocarbon are most desirable in gasoline? (a) Paraffins (b) Isoparaffins (c) Naphthenes (d) Aromatic 5: Octane no. of paraffins: (a) Remain constant with change in the number of carbon atoms (b) Increases with increase in the number of carbon atoms (c)Decreases with increase in the number of carbon atoms (d)None of the above 6: Which of the following hydrocarbons has a maximum octane number? (a) Benzene (b) Cyclohexane (c) Hexane (d) Iso-hexane 7: Which of the following petroleum products has a minimum flashpoint? (a)Gasoline (b) Kerosene (c) Fuel oil (d) Heating…Show the delocalization of charges in the following structures. Draw the resonance forms and indicate the movement of electrons with curved arrows.Hint: First draw the Lewis structure for each the compound.(i) CH2=CH─O-(ii) CH2=CH─O+c) 1) OsO4 2) H2S NaOMe Ph MeOH OTs