Question

How many primary alcoholic groups are there in glucose?

• A. One
• B. Two
• C. Three
• D. Four

Hint:

In glucose: 1 aldehyde, 4 secondary –OH, and 1 primary –OH group.

Answer 1

The Correct Option is A

Step 1: Recall glucose structure.
Glucose (an aldohexose) has 6 carbons: one aldehyde group (–CHO) at C1, four secondary –OH groups (on C2, C3, C4, C5), and one terminal –CH$_2$OH (primary alcohol) at C6.
Step 2: Identify primary alcohol.
Only carbon 6 has –CH$_2$OH group, which is primary alcohol.
Step 3: Conclude.
There is exactly one primary alcoholic group in glucose. Final Answer: \[ \boxed{One} \] % Quciktip