See image — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

# IUPAC Nomenclature of D-Glucose **Step 1: Identify the parent chain and functional group** - The structure shows a 6-carbon chain with an aldehyde group ($CHO$) at C1 - Parent name: **hexanal** (6-carbon aldehyde) - The aldehyde carbon is always C1 in IUPAC nomenclature **Step 2: Count hydroxyl groups** - There are 5 hydroxyl ($OH$) groups attached to carbons 2, 3, 4, 5, and 6 - Prefix: **pentahydroxy** **Step 3: Determine stereochemistry** - D-Glucose has a specific stereochemical configuration - In IUPAC nomenclature for carbohydrates, we don't explicitly write (D) in the name when following systematic rules - The stereochemistry is implied by the D-designation in the common name **Step 4: Construct the name** - Combine: **pentahydroxy** + **hexanal** - Full name: **D-2, 3, 4, 5, 6-pentahydroxyhexanal** **Why option B is correct:** Option B correctly lists the positions of all five hydroxyl groups (2, 3, 4, 5, 6) with the standard IUPAC nomenclature without unnecessary stereochemical descriptors like (2D, 3D, etc.) that appear in option A. **Answer: (B)**