Question

Refer the structure of Domoic Acid show in the box. For questions 51 thru 56, the number on the structure of the molecule correspond to the question number. How many chiral carbons are in Domoic Acid? A) four B) six C) two D) three E) five Functional group #52. is A) cis B)trans C) chiral D) enantiomeric E) none of the above What will be the charge on this molecule at pH 7.4? A) +1 B) 0 C) -1 D) -2 E) -3 The amine in this molecule is A) primary B) secondary C) tertiary D) quaternary E) benzylic For questions 51 thru 56, identify the functional groups, labeled 51 thru 56, in the molecule. A) amine B) alkene C) amide D) alcohol E) acid Which of the following is an example of a buffer? A) KOAc and NaOAc B) H_3PO_4 and K_2HPO_4 C) H_2CO_3 and Na_2CO_3 D) H_2CO_3 and LiHCO_3 E) HNO_3 and NaNO_3 Which of these molecules will be meso when the aldehyde and prima alcohol are oxidized to acids. Because aldehydes oxidize so easily, Dr. Dang keeps her aldehydes cold by putting them in the refrigerator, This shows down oxidation and prevents these compounds from turning into the carboxylic acid. Which of the following compounds from turning compounds does NOT need to be kept in the refrigerator? A. almond extract B. vanilla extract C. cinnamon oil D. spearmint oil

Answer 1

56) Since Domoic Acid is an organic acid. the functional group in domoic acid is acid (-COOH). Right option is E.

57). chiral carbon is acarbon atom that is attached to four different types of atoms or groups of atoms. So, there are such 3 carbon atoms in domoic acid.

58). Correct option is e) None of the above, beacuse cis, trans, enatiomeric are types of isomer and chirality is a property.

59). -1 because solution will be slightly alkaline and little decomposition of acid will take place.

60) Primary because the carbon atom to which -NH₂ is bonded, that carbon atom is attached with only 1 carbon atom.

61) A buffer is either a weak acid and the salt of that weak acid or a weak base and the salt of that weak base.

Sice, HNO_3, H₃PO₄ are strong acids, they can not form buffer.

option 1 ) is correct both KOAc and NaOAc is salt of weak ethanoic acid.