uvity.aorlocator assignment-take Splitting of a signal in a proton NMR spectrum

Question

uvity.aorlocator assignment-take Splitting of a signal in a proton NMR spectrum tells us the mumber of chemically non-equivalent hydrogens in the immediate vicinty of the hydrogen giving the signal. Predict the number of lines exhibited by hydrogens at the labeled postions in a first order NMR spectrum. (Make the approximation that all coupling constants are equal) vicn 1) The number of lines exhibited by hydrogen(s) a is 3 The number of lines exhibited by hydrogen(s) b s15 The number of lines exhibited by hydrogen(s) c is 3 2) a C The number of lines exhibited by hydrogen(s) a is The number of lines exhlbited by hydrogeno bis The number of lines exhibited by hydrogen(s) b is The number of lines exhibited by hydrogen(s) c is

Explanation / Answer

Starting from top and going to bottom

Part A) Hydrogen signals

1)

The number of lines exhibited by hydrogen(s) a is = 2

The number of lines exhibited by hydrogen(s) b is = 9

The number of lines exhibited by hydrogen(s) c is = 2

2)

The number of lines exhibited by hydrogen(s) a is = 2

The number of lines exhibited by hydrogen(s) b is = 6

The number of lines exhibited by hydrogen(s) c is = 5

Part B) Hydrogen signals

1)

The number of lines exhibited by hydrogen(s) a is = 4

The number of lines exhibited by hydrogen(s) b is = 9

The number of lines exhibited by hydrogen(s) c is = 2

2)

The number of lines exhibited by hydrogen(s) a is = 2

The number of lines exhibited by hydrogen(s) b is = 5

The number of lines exhibited by hydrogen(s) c is = 8

Part C) Hydrogen signals

1)

The number of lines exhibited by hydrogen(s) a is = 1

The number of lines exhibited by hydrogen(s) b is = 3

The number of lines exhibited by hydrogen(s) c is = 3

2)

The number of lines exhibited by hydrogen(s) a is = 7

The number of lines exhibited by hydrogen(s) b is = 4

The number of lines exhibited by hydrogen(s) c is = 3

Carbon Signals

Part A) Carbon signals

1)

The carbon with smallest delta value (the most shielded) is = a

The carbon with largest delta value (the most dishielded) is = b

2)

The carbon with smallest delta value (the most shielded) is = a

The carbon with largest delta value (the most dishielded) is = c

Part B) Carbon signals

1)

The carbon with smallest delta value (the most shielded) is = a

The carbon with largest delta value (the most dishielded) is = c

2)

The carbon with smallest delta value (the most shielded) is = a

The carbon with largest delta value (the most dishielded) is = b

Part C) Carbon signals

1)

The carbon with smallest delta value (the most shielded) is = c

The carbon with largest delta value (the most dishielded) is = a

2)

The carbon with smallest delta value (the most shielded) is = b

The carbon with largest delta value (the most dishielded) is = c

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