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Give the structural formulas of compounds A, B, and C in the following problems. EXPLAIN EXACTLY HOW YOU ARRIVED AT EACH ANSWER.Compound A is a water-soluble liquid that gives positive 2,4- dinitrophenylhydrazine and iodoform tests and a negative Tollensâ€TM test. The IR spectrum of A has bands at 2950, 1720 and 1370 cm-1. The 1H NMR spectrum consists of four signals: a triplet at ï¤ 2.3, a singlet at ï¤ 2.0, a sextet at ï¤1.3 and a triplet at ï¤ 1.2. in a ratio of 2:3:2:3 respectively.
Compound B is a liquid that is insoluble in water but soluble in 5% HCl. The 13C NMR spectrum of B consists of four signals in the ï¤ 100-140 region (DEPT indicates CH, CH, CH and C) and another signal at ï¤ï€ 55 (DEPT indicates CH3). The IR spectrum of B has bands at 3410, 1600 and 1500 cm-1 but none at 1620-1680 cm-1.
Compound C, molecular weight 118, is soluble in water to give a solution with a pH of 3. A 0.330-gram sample of C requires 27.9 mL of 0.200 M NaOH to reach the end point in a titration. The 1H NMR spectrum of C consists of the following signals: Splitting ï¤ Relative Area a singlet 13.1 2 b quartet 3.6 1 c doublet 1.8 3
The half-life for a first order reaction at 550 oC is 85 sec. How long it would take for 23% of the reactant to decompose?
The product of the complete hydrolysis contained 1.8 mg of the compound shown below, and no other 2,4-dinitrophenyl derivatives of the ?-amino groups of other amino acids could be found How many polypeptide chains are in this protein?
If a car has an EPA mileage rating of 30 miles per gallon, What is this rating in km L-1? 1 liter = 1 dm3, 1 gallon = 3.785 liter, 1 mile = 1.609 km.
temperature of 15.4°C is placed flat on a sheet of iron weighing 21.3 g and at a temperature of 46.6°C. What is the final temperature of the combined metals?
Electrons are ejected from sodium metal by any light that has a wavelength shorter than 544 nm. What is the kinetic energy of an electron
Draw (S)-3-hexanol, then indicate the stereochemistry of the product formed when it is treated with each of the following reagents
what is the UV absorption region of uracil,5-bromo uracil,5-chloro uracil, 5-iodo uracil, 6-methyl uracil?
A 20.0- sample of 0.125 HNO3 is titrated with 0.150 NaOH. Calculate the for at least five different points throughout the titration curve and make a sketch of the curve.
a 27.7 ml sample of CO2 was collected over water at 25.0 degrees celcius and 1.00 atm.(the vapor pressure of water at 25.0 degrees celcius is 23.8 torr) What will the volume be at the same temperature and pressure after removing the water vapor?
If 3.93 g of sodium borohydride contains 2.5 × 10^23 H atoms, how many moles of H are present in 27 cm3 of sodium borohydride (of density 1.074 g/cm3)?Answer in units of mol
the practical benefits of using a more favorable direction of the reaction for a routine enzyme activity assay
In a 0.1 molar solution of NaCl in water, which one of the following will be closest to 0.1?" A) the mole fraction of NaCl B) The mass fraction of NaCl
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