Question

transform the structural formulas below into fischer projection formulas:

Explanation:

Step1: Recall Fischer - projection rules

In Fischer projections, horizontal lines represent bonds coming out of the plane and vertical lines represent bonds going into the plane.

Step2: Analyze structure A

Orient the original 3 - D structure to match the Fischer - projection rules. Place the main carbon - chain vertically. The $CH_3$ is on the left, $F$ is on the top - vertical, $Br$ on the bottom - vertical and $OH$ on the right.

Step3: Analyze structure B

Identify the two chiral centers. Place the carbon - chain with the two methyl groups ($CH_3$) vertically. Arrange the substituents ($Cl$, $H$, $F$, $OH$) on the horizontal lines according to their spatial orientation in the 3 - D structure.

Answer:

The correct Fischer - projection formulas are the ones in the first set of options (top - most set of Fischer - projection attempts):
A. For the first structure:

• Vertical bonds are dashed - wedge bonds going back into the plane in the original structure. In Fischer projection, the carbon - chain is placed vertically with the most oxidized end (if applicable) at the top. Here, the methyl group ($CH_3$) is on the left, fluorine ($F$) is on the top - vertical, bromine ($Br$) is on the bottom - vertical and hydroxyl group ($OH$) is on the right.

B. For the second structure:

• The two methyl groups ($CH_3$) are placed vertically, with the chlorine ($Cl$) and hydrogen ($H$) on one horizontal line and fluorine ($F$) and hydroxyl group ($OH$) on the other horizontal line.