The statement which is incorrect withrespect to glucose is

Options

A. Reduces Felhing's solution and Tollen's reagent
B. Reacts with hydroxylamine to form an oxime
C. Adds a molecule of hydrogen cyanide to give cyanohydrin
D. Gives yellow ppt with I2 in alkali

Answer

To determine which statement is incorrect with respect to glucose, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Option 1: Glucose reduces Fehling's solution and Tollen's reagent.**
- Glucose is a reducing sugar, which means it can reduce certain chemical reagents. Fehling's solution and Tollen's reagent are both oxidizing agents that can be reduced by glucose. Therefore, this statement is **correct**.

2. **Option 2: Glucose reacts with hydroxylamine to form oxime.**
- Hydroxylamine reacts with aldehydes and ketones to form oximes. Glucose, which has an aldehyde group in its structure, can indeed react with hydroxylamine to form an oxime. Thus, this statement is also **correct**.

3. **Option 3: Glucose adds a molecule of hydrogen cyanide to give hydrocyanohydrin.**
- Glucose can react with hydrogen cyanide (HCN) to form a hydrocyanohydrin. This reaction occurs due to the nucleophilic addition of HCN to the carbonyl group of glucose. Hence, this statement is **correct**.

4. **Option 4: Glucose gives a yellow precipitate with iodine in alkali.**
- This statement is incorrect. Glucose does not react with iodine in an alkaline medium to form a yellow precipitate. In fact, iodine typically reacts with starch to produce a blue-black complex, not with glucose. Therefore, this statement is **incorrect**.

### Conclusion:
The incorrect statement with respect to glucose is **Option 4**: "Glucose gives a yellow precipitate with iodine in alkali."