Select all substances with a hydrogen atom that would participate in hydrogen bonding with an appropriate acceptor atom.
(CH3)2CO(acetone), CO(carbon monoxide), S8(octasulfur), CHClCHCl (cis-1,2-dichloroethene),CF3CF3(hexafluoroethane),CH3COCH3CH2 (methylethylketone)
Again, this question is as confusing as the last one; however, if we are to select substances "with a hydrogen atom" that immediately disqualifies acetone, CO, S8 and CF3CF3. Right? Which just leaves 1,2 dichloroethene. right?
i did not come up with these questions and the answer is none...
To determine which substances have a hydrogen atom that can participate in hydrogen bonding, we need to identify molecules that satisfy two conditions:
1. The molecule must have a hydrogen atom bonded to a highly electronegative atom such as nitrogen (N), oxygen (O), or fluorine (F). These atoms have a strong pull on shared electrons, creating a partial positive charge on the hydrogen atom.
2. The molecule must have an appropriate acceptor atom that can form a hydrogen bond with the hydrogen. Common acceptor atoms are nitrogen (N), oxygen (O), and fluorine (F). These atoms have lone pairs of electrons that can form a hydrogen bond with a hydrogen atom.
Now let's examine each substance mentioned:
1. (CH3)2CO (acetone): Acetone has a hydrogen atom bonded to a carbon atom, which is not highly electronegative. Therefore, acetone does not participate in hydrogen bonding.
2. CO (carbon monoxide): Carbon monoxide does not have a hydrogen atom at all, so it cannot participate in hydrogen bonding.
3. S8 (octasulfur): Octasulfur molecule consists of sulfur atoms bonded to each other. It does not have a hydrogen atom, and therefore, it cannot participate in hydrogen bonding.
4. CHClCHCl (cis-1,2-dichloroethene): Although this molecule contains hydrogen atoms, there are no highly electronegative atoms bonded to the hydrogen atoms. Thus, cis-1,2-dichloroethene does not participate in hydrogen bonding.
5. CF3CF3 (hexafluoroethane): Hexafluoroethane does not have a hydrogen atom bonded to highly electronegative atoms (carbon is bonded to fluorine, which is electronegative but does not have a hydrogen atom bonded to it). Therefore, it does not participate in hydrogen bonding.
6. CH3COCH3CH2 (methylethylketone): Methylethylketone has a hydrogen atom bonded to an oxygen atom (which is highly electronegative) and has a lone pair of electrons. This molecule satisfies both conditions and can participate in hydrogen bonding.
Based on the analysis, the only substance in the given list that can participate in hydrogen bonding is CH3COCH3CH2 (methylethylketone).