How many chiral carbons are in 4 -bromo- 2 -chloro-2butanol? $(\mathbf{a}) 0,(\mathbf{b}) 1,(\mathbf{c}) 2,(\mathbf{d}) 3,(\mathbf{e}) 4$ or more.

Short Answer

Expert verified
Answer: \(\mathbf{(b)}\) 1 chiral carbon.

Step by step solution

01

Draw the structure of 4-bromo-2-chloro-2-butanol

To draw the structure, we begin with the parent chain of 4 carbons (butane) and then add the functional groups at the specified positions: 4-bromo, 2-chloro, and 2-butanol. The structure will look like this: H H Cl OH Br | | | | | C-C-C-C | | | | H H H Br
02

Identify chiral carbons

Now that we have the structure, we need to examine each carbon atom to determine whether it is chiral or not. To be chiral, a carbon must be bonded to four different groups. Carbon 1 (C1): bonded to 3 hydrogens and C2. Not chiral. Carbon 2 (C2): bonded to C1, C3, a chlorine atom, and a hydroxyl (OH) group. Chiral. Carbon 3 (C3): bonded to C2, C4, and 2 hydrogens. Not chiral. Carbon 4 (C4): bonded to C3, a bromine atom, and 2 hydrogens. Not chiral.
03

Determine the number of chiral carbons

From our previous analysis, we found that only carbon 2 (C2) is chiral in the compound 4-bromo-2-chloro-2-butanol.
04

Choose the correct answer

Since we found only 1 chiral carbon, the correct answer is: Answer: \(\mathbf{(b)}\) 1 chiral carbon.

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