Select all substances with an acceptor atom that can hydrogen bond to a hydrogen atom that is part of a polar covalent bond

HCCH (ethyne), Br2 (dibromine), H2CCH2 (ethene), CH3Cl (chloromethane), CH3CH2CO2H (propionic acid), OF2(oxygen difluoride)

sorry for the double post

I'm confused by the question but if I interpret it correctly, the answers are propionic acid and OF2. CH3Cl has all orbitals filled, as does Br2, ethene, and ethyne so I don't think the latter ones have an acceptor atom. Check my thinking.

To determine which substances have an acceptor atom that can hydrogen bond to a hydrogen atom that is part of a polar covalent bond, we need to identify the molecules that contain hydrogen bond acceptors (typically electronegative atoms) and also have a hydrogen atom bonded to an electronegative atom.

1. HCCH (ethyne): Ethyne does not have any electronegative atoms that can act as hydrogen bond acceptors.

2. Br2 (dibromine): Dibromine consists of two bromine atoms bonded covalently, and it does not contain any hydrogen atoms.

3. H2CCH2 (ethene): Ethene also does not have any electronegative atoms that can be hydrogen bond acceptors.

4. CH3Cl (chloromethane): Chloromethane does have an electronegative atom, chlorine (Cl), that can act as a hydrogen bond acceptor. It also has a hydrogen atom bonded to chlorine, which can participate in hydrogen bonding.

5. CH3CH2CO2H (propionic acid): Propionic acid contains both an electronegative oxygen atom and a hydrogen atom bonded to oxygen. Oxygen can act as a hydrogen bond acceptor, and the hydrogen atom bonded to oxygen can participate in hydrogen bonding.

6. OF2 (oxygen difluoride): Oxygen difluoride has an electronegative oxygen atom that can act as a hydrogen bond acceptor. It also contains hydrogen atoms bonded to oxygen, which can participate in hydrogen bonding.

Based on the analysis above, the substances that have an acceptor atom that can hydrogen bond to a hydrogen atom that is part of a polar covalent bond are CH3Cl (chloromethane), CH3CH2CO2H (propionic acid), and OF2 (oxygen difluoride).