Question

Write Fischer projections for L-ribose and L-arabinose.

Short answer

Question: Provide the Fischer projections for L-ribose and L-arabinose, indicating the configuration of each chiral center. Answer: For L-ribose, the Fischer projection is: H | H-O-C | C4--H-O-C3--O-H | | H H-O-C2--O-H | | H H-O-C1--O-H | H The configuration of its chiral centers are C1(S), C2(R), C3(S), and C4(R). For L-arabinose, the Fischer projection is: H | H-O-C | C3--H-O-C2--O-H | | H H-O-C1--O-H | H The configuration of its chiral centers are C1(S), C2(R), and C3(S).

Step-by-step solution

Identify the Number of Chiral Centers

For L-ribose, there are four chiral centers (C1, C2, C3, and C4), as there are four asymmetric carbon atoms. For L-arabinose, there are three chiral centers (C1, C2, and C3).

Determine the Configuration of Chiral Centers

For L-ribose, the configuration of chiral centers are established as C1(S), C2(R), C3(S), and C4(R). For L-arabinose, the configuration of chiral centers is C1(S), C2(R), and C3(S).

Draw the Fischer Projections

Following the configuration of the chiral centers, we can now draw the Fischer projections for L-ribose and L-arabinose. L-ribose: H | H-O-C | C4--H-O-C3--O-H | | H H-O-C2--O-H | | H H-O-C1--O-H | H L-arabinose: H | H-O-C | C3--H-O-C2--O-H | | H H-O-C1--O-H | H