Concept explainers
(a)
Interpretation:
The structure of ascorbic acid as it exists at the physiological
Concept introduction:
The
(b)
Interpretation:
The resonance structures of the structure of ascorbic acid as it exists at the physiological
Concept introduction:
Resonance is the phenomena of the delocalization of pi electrons to give extra stability to the molecule. This extra stability comes from the distribution of the energy of the molecule in the resonance structures formed.
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Organic Chemistry
- Tyrosine is an amino acid whose side chain has a pKa of 10.1. At pH 7, what protonation form would you expect to find it in?arrow_forwardAcetic acid can also react as a very weak base (pKb = 20). Two different sites on acetic acid might become protonated to give the conjugate acid. Draw both of these possible conjugate acids, and explain (resonance) why the correct one is more stable. Calculate the pKa of this conjugate acid.arrow_forwardUsing pKa Values to Determine Relative Acidity and Basicity Rank the following compounds in order of increasing acidity, and then rank their conjugate bases in order of increasing basicity.arrow_forward
- Which of the underlined protons for molecule 1 and 2 is more acidic and why?arrow_forwardwhich of the following explain the relative acidity of the indicated protons?arrow_forwardFollowing is a structural formula for guanidine, the compound by which migratory birds excrete excess metabolic nitrogen. The hydrochloride salt of this compound is a white crystalline powder, freely soluble in water and ethanol. Q. Does proton transfer to guanidine occur preferentially to one of its -NH2 groups (cation A) or to its =NH group (cation B)? Explain.arrow_forward
- Describe the trends in the acidityand physical properties of carboxylicacids, and explain how their acidityvaries with their substituents.arrow_forwardProvide an explanation without using the pka values : Why is phenol stronger acid than butanoic acid?arrow_forwardS.2. List the following compounds by discussing their basicity.arrow_forward
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