6 . Which of the two possibilities below correctly numbers the carbon backbone of this
molecule?(A) Numbering Scheme 1
(B) Numbering Scheme 2
(C) Numbering Schemes 1 and 2 are equivalent and correct.
(D) Numbering Schemes 1 and 2 are equivalent and incorrect.
7 . What is the proper structure for 2,3-dihydroxybutanedioic acid (tartaric acid)?