strong acid & bases, NMR

a. There are only four lines in the aromatic region of the fully 1H decoupled 13C NMR spectrum of propyl p-tolyl ether (110-160 ppm), yet there six aromatic carbon atoms. Explain. b. Which is a stronger base, aniline or cyclohexylamine? Explain. c. Write an equation for the reaction of pthalimide with potassium amide (a str ...continues

pH problems

a. Predict which of the following species is the most acidic. Explain. Phthalimide or Benzamide b. What product would you expect to obtain from the reaction of one quivalent of propanol with phthalic anhydride?

TLC, azobenzene

a. Discuss what you would observe after elution and visualization of a TLC plate having made the following mistakes in carrying out the anaylsis. 1. The solvent level in the developing jar was higher than the original line on which the samples were spotted. 2. Too much sample was applied to the TLC plate. b. Over the years ...continues

Need help

a. Ferrocene cannot be nitrated using the conventional HNO3-H2SO4 mixed acid conditions, even though nitration is an electrophilic aromatic substitution reaction. Explain. b. In the formation of diacetylferrocene, the product is always the one in which each ring is monacetylated. Thy is no diacetylferrocene produced in whi ...continues

equations

a. Sodium bisulfite solution is added to an experiment at the end in order to destroy the unreacted bromine. What reaction is occuring here? Is HSO3- acting as an oxidizing or reducing agent? Write a balanced equation. b. Write equations to show how nitronium ions might be formed using a mixture of nitric and sulfuric acids.

haloform

a.If you were carrying out an industrial scale sythesis in which one step involved a haloform reaction to convert a methyl ketone into the corresponding acid having one less carbon atom, would you use NaOH and Cl2, NaOH & Br2, or NaOH and I2 reagent? Give reasons. b. Write a balanced equation for the conversion of C6H5CHOHCH3 ...continues

chemical tests

a. What chemical tests might be used to ditinguish between pentanal and 2-pentanone; between benzyl alcohol and diphenylmethanol? b. Pinacol upon heating in aqueous acid, rearranges to form pinacolone. Suggest a mechanism for this reaction.

Dilution

A serial dilution is used to prepare solutions containing amounts(grams)of chemicals so small that they would be impossible to measure with ordinary balance. If 5.00ml of a .10 Molar salt (NaCl) solution is diluted to 500ml,then diluted to 500ml of another new solution, what is its concentration. If 5.00 ml of this solution is d ...continues

solution

A solution of sodium cyanide (NaCN)is prepared by dissolving 50 grams into 500ml of solution. What is the Molarity,%(w/v), andppm of the resulting solution.

Melting Point Determination

1. In a mixture of approx. 20% camphor and 80% naphthalene. What would you expect the melting point to be? (+/-)camphor (175-177 Celsius) and naphthalene (80-81 Celsius). 2. Describe the expected type of error in the observed m.p. (unaffected, high, low and /or broad) when the melting point is determined as follows. a. ...continues