Rank the indicated carbon atoms in order of increasing chemical shift. Ca Cb C Br

Question

Question

Rank the indicated carbon atoms in order of increasing chemical shift.

Ca Cb C

Answer 1

Answer #1

The chemical shift of double bonded carbon is the highest while the carbon in the middle of the chain is leat.

The increasing chemical shift values of given three are

Cb < Cc < Ca The values are

Cb in the range 15 -55ppm

Cc in the ranage 25-65 ppm (due to electronegative Br)

Ca in the range 100-150 ppm (olefinic sp2 carbon)

Answer 2

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