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Which of the following molecules cannot form hydrogen bonding among themselves? A) CH₂O B) CH₃CHO C) (CH₃ – CH₂)₃N D) All of the above
  1. CH₂O
  2. CH₃CHO
  3. (CH₃ – CH₂)₃N
  4. All of the above
Explanation

The molecule that cannot form hydrogen bonding among themselves is All of the above. 


Hydrogen bonding occurs when a hydrogen atom is bonded to a highly electronegative atom (oxygen, nitrogen, or fluorine) in one molecule and is attracted to the lone pair of electrons on another electronegative atom in a different molecule. 

A) CH₂O (Formaldehyde):

While the oxygen is electronegative, the hydrogen is not directly bonded to it, so it cannot participate in hydrogen bonding.

B) CH₃CHO (Acetaldehyde):

Similar to A, the hydrogen is not directly bonded to the oxygen.

C) (CH₃ – CH₂)₃N (Trimethylamine):

Although the nitrogen is electronegative, the hydrogen atoms are not directly bonded to the nitrogen.

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