1. Which of the following functional groups most appropriately describes the type of acyl group in...
1. Which of the following functional groups most appropriately describes the type of acyl group in vitamin C?
A. lactum
B. ester
C. ether
D. lactone
2. When an oxidant is present, vitamin C can be converted to a product described as (5R)-5-[(1S)-1,2-dihydroxyethyl]-3,4-dihydroxy-furan-2,3,4(5H)-trione, which retains the furan-based nomenclature of vitamin C and describes the hydrogen placement at atom 5 of the ring. Which of the following statements best describes this vitamin C derivative?
A. Vitamin C is oxidized to yield a furan ring with 3 carbonyl groups and no double bonds.
B. Vitamin C is oxidized to yield a furan ring with 3 carbonyl groups and 1 double bond.
C. Vitamin C is reduced to yield a furan ring with 4 carbonyl groups and no double bonds.
D. Vitamin C is reduced to yield a furan ring with 1 carbonyl group and no double bonds.
3. Why do the mass and exact mass of vitamin C differ?
A. The exact mass term includes contributions from the stable isotopes of all elements in the molecule, while the mass term considers only the most abundant isotope of each element.
B. The mass term includes contributions from the stable isotopes of all elements in the molecule, while the exact mass term considers only the most abundant isotope of each element
C. The exact mass is obtained from theoretical calculations, while the mass is experimentally obtained using an analytical balance.
D. The exact mass does not consider the mass of the electrons.
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