2. A molecule or ion that donates the hydrogen in a hydrogen bond is a hydrogen
ID: 557364 • Letter: 2
Question
2. A molecule or ion that donates the hydrogen in a hydrogen bond is a hydrogen bond donor. A molecule or ion that binds to this hydrogen is a hydrogen bond acceptor. Specify the hydrogen bonding behavior of the these molecules below by choosing from: (I pts, 0.25 pt each) A. acts as hydrogen bond donor only (so it CAN NOT be acceptor) B. acts as hydrogen bond acceptor only (so it CAN NOT be donor) C. acts as both hydrogen bond acceptor and donor D. CAN NOT act as hydrogen bond acceptor, NOR donor Molecule 1. (choose from A-D above) NH2 Molecule 2. (choose from A-D above) Molecule 3. (choose from A-D above)Explanation / Answer
The hydrogen bond is an attractive interaction between a hydrogen atom from a molecule or a molecular fragment X–H in which X is more electronegative than H, and an atom or a group of atoms in the same or a different molecule, in which there is evidence of bond formation.
In a hydrogen bond, the electronegative atom not covalently attached to the hydrogen is named proton acceptor, whereas the one covalently bound to the hydrogen is named the proton donor.
In molecule 1 we have benzene ring and three hydrogen atoms attached to the Si atom which means all it lone pairs are occupied and thus it can only act as a hydrogen bond donor so A is the correct answer.
in molecule 2 we have benzene ring and 2 hydrogens attached a Nitrogen atom the Nitrogen atom is capable of forming/accepting hydrogen bonding with other hydrogen atoms, and can also act as the donor for a more electronegative atom and thus C is the correct answer.
in molecule 3 C5H10O we have more electronegative atom Oxygen wich has only made two bonds with carbon atoms and it's lone pairs arestill not occupied thus it can acts as hydrogen bond accepter since there is no Hydrogen it can be a donor of Hydrogen bond which makes B the correct answer.
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