12.
Answer: A. Fischer projections are typically drawn with hydrogens on vertical lines & carbon chains on horizontal lines
In case of tie the atom priorities are assigned based on the molecular weight of the next atom in the chain, therfore B is not correct
In choosing between R & S, The lowest priority group should be away from the observer.
Rotation of C=C bond is hindered by the Pi bond overlap
when numbering carbons in a chain, Choose the order that assigns the lowest possible number to the functional groups
13.
14.
D. Increased reaction temperatures with little solvent loss
refluxing allows the reaction to be heated at the boiling temeratures of the solvent with the vapours getting condensed back to the reaction medium.
15.
A. Protonates the C=O, allowing for molecular rotation.
The protonation of the carbonyl oxygen increases the electrophilicity of the carbonyl carbon polarising the C=C double bond which is in resonance with the C=O bond, Allowing for the molecular rotation to convert maleic acid to fumaric acid.
Which of the following is written correctly? A. Fisher projections are typically drawn with hydrogens on...
Postlab Questions Answer the following questions on a separate sheet or in your lab notebook. Make sure that the copy page is readable! D) Calculate the percentage yield for both reactions. Show all calculations. 2) What is the color of the reaction at the beginning of reaction? What causes the color? 3) Why do you dissolve maleic acid in diethyl ether and fumaric acid in water? 4) Give the complete reaction mechanisms for the formation of meso and racemic 2,3-...
4 Which of the fotlowing is the most reactive carhosylie acid derivative A) ester D) anhydride 2 nitrile D) acid chloride E) amide 11) Typically, amides will hydrolyse under A) stronger B) more dilute conditions than esters C) milder D) less vigorous E) more saline 12) 1-Methyleyclopentanol is classified as A) a primary aloohol B) a secondary alcohol C) a tertiary alcohol D)a phenol E) an enol 13. For a diene to undergo a Diels-Alder reaction it must: be substituted...
____ 1. The diagram below represents serine, a polar, uncharged amino acid. Which functional group gives serine its distinct property? a. H3 b. CH2OH c. –H d. COO– ____ 2. The monomers shown below are monomers for which of the following natural polymers? a. polysaccharides b. plastics c. DNA d. proteins ____ 3. Which of the following processes illustrates the production of a protein? a. specific code for amino acids --> amino acid chain --> gene --> DNA --> specific...
Can you help me identify reagent (i), Compound 8 and Compound 12 in the reaction scheme? You have laboratory data on all the compounds in the synthesis, however the amount of data available to you varies. Some have the entirety of the spectral data, others have as little as the elemental analysis. Use the laboratory data to help you discover which reaction has been performed. The lab data for Compound 8 and 12 is as follows: You can use any...
QUESTION 1 Which of the following options lists the stages in cellular respiration in the correct order? A. glycolysis, oxidative phosphorylation, pyruvate oxidation, and the citric acid cycle B glycolysis, pyruvate oxidation, the citric acid cycle, and oxidative phosphorylation C. pyruvate oxidation, oxidative phosphorylation, glycolysis, and the citric acid cycle D. the citric acid cycle, oxidative phosphorylation, pyruvate oxidation, and glycolysis QUESTION 2 When a glucose molecule loses a hydrogen atom as the result of an oxidation-reduction reaction, the glucose...
Questions and Problems 553 ation for the reaction that would produse cach of the following amines b. N.Methylpropanamine c. N.N-Diethylpentanamine 15.37 Briefly explain why the lower molar massamines (lewer than five carbons) exhibit appreciable solubility in water 15.38 Why is the salt of an amine appreciably more soluble in water than the mine from which it was formed 15.39 Most drugs containing amine groups are not administered as the mine but rather the amount you suggeste son why? 15.40 Why...
Cyw Ala Ατα Ile Ausn Lou Asp aly Lys Ser Which molecule below is asubunit of peptide chains a. Acetic acid b. Alanine O. ATP d. Gracil Report the charge on most aqueous aspartie acid molecules at pH-7. Report the approximate p values for the amino acid whose titration curve is shown below (note there may be more slots for answer than answers). A) Value 1 B) Value 2 c) Value 3 c) Value 4 The structure of a rare...
Microbiology study guide questions. Please Help! s. which of the following statements about water activity is not true? a) many fungi can tolerate aw levels of 07-0.8 b) many microorganisms grow well at an aw of 0.98 e sear water has an aw of 0.98 e-xerephiles thrive in dry conditions DNA typically becomes disordered below an a of o.90 Which of the following descriptions about ribosome structure is not true? a) 80s is the size of the intact functional ribosome...
e. 18 Test Your Knowledge MULTIPLE CHOICE: Choose the one best answer. 1. Each element has its own characteristic atom in which a. the atomic mass is constant. b. the atomic number is constant. c. the mass number is constant. d. Two of the above are correct. e. All of the above are correct. 2. Which of the following is not a trace element in the human body? a. iodine b. zinc c. iron d. calcium e. fluorine 3. A...
All of the following questions are in relation to the following journal article which is available on Moodle: Parr CL, Magnus MC, Karlstad O, Holvik K, Lund-Blix NA, Jaugen M, et al. Vitamin A and D intake in pregnancy, infant supplementation and asthma development: the Norwegian Mother and Child Cohort. Am J Clin Nutr 2018:107:789-798 QUESTIONS: 1. State one hypothesis the author's proposed in the manuscript. 2. There is previous research that shows that adequate Vitamin A intake is required...