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Question

How many chiral carbon atoms are there in the open-chain form of glucose?


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Solution

Chiral carbons in glucose:

  • A carbon atom attached to four different atoms or groups of atoms is known as chiral carbon.
  • The molecular formula of Glucose is C6H12O6
  • The structure of glucose has one aldehyde group at any end of the carbon chain in the open-chain form of glucose.

  • The first and sixth Carbon is attached to two same hydrogen atoms hence it is not a chiral atom.
  • The second, third, fourth, and fifth are attached to four different groups hence it is a chiral carbon atom.
  • The glucose molecule can exist as an open straight chain as well as in ring form.
  • The open straight chain of Glucose is an open and unbranched backbone of six carbon.
  • In the First Carbon, the aldehyde group(CHO) is present, in the sixth carbon Hydroxyl (OH) group is present and the remaining valencies of carbon are satisfied by hydrogen atoms.

Hence, there are four chiral carbon atoms in the open-chain form of glucose.


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