Question

How many chiral carbons are present in glucose molecule $CHO(CHOH{)}_{4}C{H}_{2}OH$?

• A. 4
• B. 3
• C. 2
• D. 1

Answer 1

The correct option is A 4

Chiral carbon is a asymmetric carbon where all 4 substituted groups were different.
Glucose is made of 6 membered carbon chain. In carbon 1, aldehyde group will be present. Thus due to doubly bonded to oxygen it is not a chiral carbon. In carbon 6, two hydrogen atoms were attached so its not a chiral carbon. Other four carbons are chiral carbon. It should in the structure below,
$OHC.CH\left(OH\right).CH\left(OH\right).CH\left(OH\right).CH\left(OH\right)C{H}_{2}OH$