Question

which are the chiral carbons in d - ribose? use the labeled carbon numbering to enter your answer, and separate your answers with commas if there is more than one.
provide your answer below:

Explanation:

Step1: Recall the definition of chiral carbon

A chiral carbon has four different groups attached to it.

Step2: Analyze each carbon in D - ribose

• Carbon \(1\): It has a double bond to oxygen (\(C = O\)), so it cannot be chiral (only three groups attached in a sense of double - bond equivalent).
• Carbon \(2\): Attached to \(H\), \(OH\), \( - CH(OH)-\) (from carbon \(3\)), and \( - C(=O)-\) (from carbon \(1\)). Four different groups.
• Carbon \(3\): Attached to \(H\), \(OH\), \( - CH(OH)-\) (from carbon \(2\)), and \( - CH(OH)-\) (from carbon \(4\)). Four different groups.
• Carbon \(4\): Attached to \(H\), \(OH\), \( - CH(OH)-\) (from carbon \(3\)), and \( - CH(OH)-\) (from carbon \(5\)). Four different groups.
• Carbon \(5\): Attached to two \(H\) atoms (one is directly attached and the other is part of the overall structure in a sense that it has two hydrogens equivalent in terms of non - uniqueness for chirality), \(OH\), and \( - CH(OH)-\) (from carbon \(4\)). Not four different groups.

Answer:

2,3,4