Carbonyl compounds can be protonated on the carbonyl oxygen. Protonation of the carbonyl oxygen gives a species whose positive c
harge is delocalized by resonance. Explain why acetic acid (ethanoic acid) is more readily protonated than acetone (propanone).
1 answer:
Answer:
Full explanation is given below.
Explanation:
Positive charge on carbonyl oxygen atom in protonated acetic acid is delocalized by stronger electron donating resonating effect of lone pair of oxygen atom in adjacent -OH group.
Positive charge on carbonyl oxygen atom in protonated acetone is delocalized by weaker electron donating inductive effect of two adjacent methyl groups.
Higher the delocalization of positive charge, higher will be stability of protonated species. Hence acetic acid is more rapidly protonated.
Resonance structures of protonated acetic acid has been shown below.
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Answer:
As the y-intercept increases, the graph of the line shifts up;
As the y-intercept decreases, the graph of the line shifts down
Explanation:
There are two ways to think about this problem. The first way would be the graphical approach:
- if we only change the y-intercept, this means we keep the same slope;
- y-axis is the vertical axis;
- if we change the point at which the line crosses the y-axis, we either shift it upward for a higher y-intercept or downward for a lower y-intercept.
Now, thinking algebraically, a line has the following equation in a general form:
The y-intercept is essentially obtained when x = 0, then:
y = b:
- if we increase b value, the y value increases, so the graph shifts upward;
- if we decrease b value, the y value decreases, so the graph shifts downward.