Question

question
how many chiral carbons are there in the compound shown below?
ho - ch₂ - ch - ch - c - h

oh oh o
provide your answer below:
carbons
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Explanation:

Step1: Recall the definition of chiral carbon

A chiral carbon (asymmetric carbon) is a carbon atom bonded to four different groups.

Step2: Analyze each carbon in the compound

• The first carbon (\(HO - CH_2-\)) is bonded to two \(H\) atoms (from \(CH_2\)), so it is not chiral.
• The second carbon (\(-CH-\) with \(OH\)): Let's assume the groups attached are \(H\), \(OH\), \(CH_2OH\), and the rest of the carbon - chain. These are four different groups. So, it is chiral.
• The third carbon (\(-CH-\) with \(OH\)): Assume groups are \(H\), \(OH\), the part of the chain from the left (including \(CH_2OH\) and adjacent carbon) and the part of the chain from the right (carbonyl - containing part). These are four different groups. So, it is chiral.
• The carbonyl carbon (\(-C=\)) is double - bonded, so it cannot be chiral (a chiral carbon must have four single bonds).
• The last \(H\) - attached carbon is bonded to three \(H\) atoms (not possible, but even if we consider, it doesn't have four different groups).

Answer:

2