What isthe Rand S configuration for each stereogenic centre in this sugar from top to bottom ?

• A

  $R, R, S$
• B

  $R, S, S$
• Correct answer
  C

  $\mathrm{R}, \mathrm{S}, \mathrm{R}$
• D

  $\mathrm{S}, \mathrm{S}, \mathrm{R}$

Solution

Arrange the groups in order of priority by following the text.

Hence, the correct answer is option: 'C'.