Structure (2) reacts more easily with a nucleophile because it is less hindered.
What is a nucleophile?
A nucleophile is a specie that is negatively charged or has a lone pair of electrons and readily reacts with a positive center easily.
Now looking at the two amides as shown in the image, we can see that structure 2 is less hindered than structure 1 hence (2) reacts more easily with a nucleophile because it is less hindered.
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