Which of the following is NOT soluble in water?
For hydrogen bond to be formed, there should be hydrogen in the molecule and it should be attached to N, O or F. This is present in water.
There is N in option 2. This can form hydrogen bond with water and hence will be soluble in water.
There is O in option 3. This can form hydrogen bond with water and hence will be soluble in water.
There is O in option 4. This can form hydrogen bond with water and hence will be soluble in water.
option 1 will not be soluble in water
Answer: option 1
1 for a hydrogen bond to be formed there should be hydrogen atoms
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