Arrange the following compounds in order of decreasing ease of elution from a column of silica gel: a) 2-octanol; b) 1,3-dichlorobenzene; c) tert-butylcyclohexane; d) benzoic acid
Okay i'll keep my answers the same.
What do you think is the answer.
Tert-butylcyclohexane > 1,3-dichlorobenzene > 2-octanol > benzoic acid
name*
Thanks for help DR. Bob
And changing your names makes things harder for us to do a good job for you.
To determine the order of decreasing ease of elution from a column of silica gel, we need to consider the polarity of each compound.
Silica gel is a polar stationary phase, meaning it has polar groups (silanol groups) attached to its surface. Compounds that have polar groups or are overall polar tend to interact more strongly with the silica gel, resulting in slower elution from the column.
On the other hand, nonpolar compounds tend to have weaker interactions with the polar silica gel and elute more quickly.
Now, let's analyze each compound:
a) 2-octanol: This compound has a hydroxyl group (-OH), making it polar. It can form hydrogen bonds with the polar groups on the silica gel. Therefore, it will have a slower elution compared to nonpolar compounds.
b) 1,3-dichlorobenzene: This compound does not have any polar functional groups. It is relatively nonpolar and will elute more quickly than compounds with polar groups.
c) tert-butylcyclohexane: This compound is nonpolar since it consists of mainly carbon and hydrogen atoms. It lacks polar functional groups and will, therefore, elute more quickly.
d) benzoic acid: Benzoic acid has a carboxylic acid group (-COOH), making it polar. Similar to 2-octanol, it can form hydrogen bonds with the silica gel, leading to slower elution.
Based on the analysis, the order of decreasing ease of elution from a column of silica gel would be:
1) 1,3-dichlorobenzene (most easily eluted)
2) tert-butylcyclohexane
3) 2-octanol
4) benzoic acid (least easily eluted)
Remember, this order is determined based on the polarity of each compound and how strongly it interacts with the polar silica gel.