Homework Answers
I am drawing the structure as they
are already there. I am mentioning them with explanation.
We can compare the pKa values of these pairs to say the acidity.
Smaller the pKa values stronger the acid.
a) Second compound in first pair is more acidic due to presence of nitro group. Amide group will increase the pKa so first structure is less acidic.
b) Second compound in second pair is more acidic due to presence of electron-withdrawing group. Presence of ester group in the first structure makes it less acidic and pKa will be more.
c) First compound in the third pair is more acidic due to presence of aldehyde group. Presence of aldehyde group always increase the acidity than cyano group.
d) In the fourth pair of compounds, one has a diester group and one has acyl chloride group. Presence of ester group makes the structure less acidic than acyl chloride hence first structure is more acidic than second one.
e) In the pair mentioned here one structure have aldehyde and one have ketone group in adjacent of alpha hydrogen as difference. Presence of aldehyde makes the Second compound more acidic in nature.
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