In a Diels-Alder reaction, why doesn't the carboxylic acid
attack the ester to reform the acid anhydride? Why this Diels-Alder
provides the cis-ring juncture instead of the trans?
Write the reaction when acetic acid reacts with 1 – butanol in
the presence of heat and an acid catalyst. Give the IUPAC name of
the organic product formed:
Postlab Questions
1. A student claims that a given unknown
is a carboxylic acid because the sample dissolves in water, 10%
NaOH, and 10% NaNCO3. Critique this conclusion.
2. Explain how solubility tests could be
used to differentiate between:
a. a phenol and a carboxylic acid.
b. a phenol that contains electron-withdrawing groups and a
phenol that contains electron-donating groups.
c. a carboxylic acid and an amine.
d. 1-bromooctane and dibutyl ether.
e. 2-pentyne and pentane.
f. 2-nitropentane and 2-aminopentane....
#1. Which following statement statements is WRONG for
Benzocaine?
A. It is an aromatic carboxylic ester.
B. Benzocaine is acidic in nature.
C. It is basic in nature.
D. Benzocaine is used to reduce the pain or discomfort caused by
sore throat, teething pain, rectal irritation, hemorrhoids etc.
E. It does not show any side effects if you take more than the
dose.
F. It is a colorless trapezial crystal.
a)
Benzocaine is acidic in nature.
b)
It does not...
1.) Methyl butyrate is made by an acid catalyzed condensation
of
a. Butanol and methanoic acid
b. Methyl butyric acid and methanol
c. Butyric acid and sodium methoxide
d. Methanol and butyric acid
2.) True or false: Esters have a lower potential for hydrogen
bonding than either alcohols or carboxylic acids.
In acid-catalyzed addition of water to alkene, alcohol is the product. The conjugate base of the acid may compete with water for the newly formed carbocation and give a different product (other than alcohol). Among the following acids, which is the best acid catalyst? Which is the worst? Depend your answers.
HOAc HCl H2SO4 CF3COOH
1. The carboxylic acid group of an amino acid has a pKa of
approximately 2. However, carboxylic acids like benzoic acid and
acetic acid have pKas in the range of 4-5 pKa units. Explain why
the carboxylic acid of an amino acid is more acidic.
2. Consider the amino acid arginine: a. At physiological pH (pH
= 7.4), what is the predominant form in solution? b. What percent
of the carboxylic acid group is ionized at this pH? c. What...
An unknown solid is entirely soluble in water. On addition of
dilute HCl, a precipitate forms. After the precipitate is filtered
off, the pH is adjusted to about 1 and H2S is bubbled in; a
precipitate again forms. After filtering off this precipitate, the
pH is adjusted to 8 and H2S is again added; no precipitate forms.
No precipitate forms upon addition of (NH4)2HPO4. The remaining
solution shows a yellow color in a flame test. which might be
present, might...
HX is a weak acid that reacts with water according to the
following equation: HX(aq) + H2O(l) H3O1+(aq) + X1-(aq) Ka =
3.16e-07 What is the equilibrium concentration of hydronium ion in
a solution that is 0.0538 M in HX and 0.116 M in X1- ion?