The chemical environment of protons can be deduced from their chemical shifts. W

Question

The chemical environment of protons can be deduced from their chemical shifts. What are the relative chemical shifts of the protons at the labeled positions? [Protons that are highly shielded have low delta (chemical shift) values.]

The proton with the lowest delta value (the most shielded) is .
The proton with the highest delta value (the most deshielded) is .

The proton with the lowest delta value (the most shielded) is .
The proton with the highest delta value (the most deshielded) is .

The proton with the lowest delta value (the most shielded) is .
The proton with the highest delta value (the most deshielded) is .

The proton with the lowest delta value (the most shielded) is .
The proton with the highest delta value (the most deshielded) is .

The proton with the lowest delta value (the most shielded) is .
The proton with the highest delta value (the most deshielded) is .

The proton with the lowest delta value (the most shielded) is .
The proton with the highest delta value (the most deshielded) is .

Explanation / Answer

1. c has lowest delta beacause methyl proton, b has highest delta because it is attached to sp2 hybridized carbon

2. a has lowest delta because it is methyl proton , c has highest delta becasue lies in anisotropic zone of carbonyl , also its is attached to sp2 hybridized carbon

3.a has lowest delta because methyl proton ,c has  highest delta because methylene proton

4. b has lowest delta because methyl proton, a has highest delta because attached to carbon to which oxygen (-OH) is attached.

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