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
You've only listed one substance. The H atoms on acetylene are acidic.
To identify substances with an acceptor atom that can hydrogen bond to a hydrogen atom that is part of a polar covalent bond, we need to look for molecules that contain hydrogen atoms bonded to an electronegative atom such as oxygen (O) or nitrogen (N). Hydrogen bonding occurs when a hydrogen atom is bonded to a highly electronegative atom and forms a hydrogen bond with another molecule that has a lone pair of electrons on an electronegative atom.
Let's analyze each substance:
1. HCCH (ethyne): Ethyne consists of two carbon atoms triple-bonded together. It does not contain an electronegative atom bonded to hydrogen and, therefore, cannot form hydrogen bonds.
2. Br2 (dibromine): Dibromine is a diatomic molecule consisting of two bromine atoms. Since it lacks hydrogen atoms, it cannot form hydrogen bonds.
3. H2CCH2 (ethene): Ethene is a hydrocarbon consisting of two carbon atoms double-bonded together. It does not contain an electronegative atom bonded to hydrogen and, thus, cannot form hydrogen bonds.
4. CH3Cl (chloromethane): Chloromethane contains an electronegative atom (chlorine) bonded to hydrogen. Therefore, it can form hydrogen bonds.
5. CH3CH2CO2H (propionic acid): Propionic acid contains an electronegative atom (oxygen) bonded to hydrogen. Consequently, it can form hydrogen bonds.
6. OF2 (oxygen difluoride): Oxygen difluoride comprises an electronegative atom (oxygen) bonded to hydrogen. Thus, it can form hydrogen bonds.
Based on the explanation above, the substances that have an acceptor atom capable of hydrogen bonding to a hydrogen atom in a polar covalent bond are:
- CH3Cl (chloromethane)
- CH3CH2CO2H (propionic acid)
- OF2 (oxygen difluoride)