Question 1

Protons H_a and H_b in the following compound are _________.

Accepted Answer

The answer of Protons H_a and H_b in the following...

Question 2

Which of the indicated protons in the following compound would appear most upfield in the ¹H NMR spectrum?

Accepted Answer

The answer of Which of the indicated protons in the...

Question 3

Protons H_a and H_b in the following compound are _________.

Accepted Answer

The answer of Protons H_a and H_b in the following...

Question 4

How many signals would you expect in the ¹H NMR spectrum of the following compound?

Accepted Answer

The answer of How many signals would you expect in...

Question 5

Protons H_a and H_b in the following compound are _________.

Accepted Answer

The answer of Protons H_a and H_b in the following...

Question 6

Protons H_a and H_b in the following compound are _________.

Accepted Answer

The answer of Protons H_a and H_b in the following...

Question 7

How many signals would you expect in the ¹H NMR spectrum of the following compound?

Accepted Answer

The answer of How many signals would you expect in...

Question 8

Which of the indicated protons in the following compound would appear most downfield in the ¹H NMR spectrum?

Accepted Answer

The answer of Which of the indicated protons in the...

Question 9

How many signals would you expect in the ¹H NMR spectrum of CH₃OCH₂CH₂OCH₃?

Accepted Answer

The molecule CH₃OCH₂CH₂OCH₃ has two types of hydrogen environments: the methyl (CH₃) groups and the methylene (CH₂) groups, resulting in two distinct signals in the ¹H NMR spectrum.

Question 10

How many signals would you expect in the ¹H NMR spectrum of the following compound?

Accepted Answer

The answer of How many signals would you expect in...

Question 11

How many signals would you expect in the ¹H NMR spectrum of HOCH₂CH₂CH₂CH₂OH?

Accepted Answer

The molecule HOCH2CH2CH2CH2OH has three types of hydrogen environments: the hydrogens on the terminal -CH2OH groups are equivalent, and the two internal -CH2- groups are equivalent, leading to three distinct signals in the 1H NMR spectrum.

Question 12

How many signals would you expect in the ¹H NMR spectrum of the following compound?

Accepted Answer

The compound has one S1 group, one S0 group, two S1/2 groups, and one P1 group. 
S1 group gives a singlet signal
S0 group gives a singlet signal
S1/2 groups gives two doublet signals
P1 group gives a multiplet signal
Therefore, there will be a total of 7 signals in the NMR spectrum.

Question 13

How many signals would you expect in the ¹H NMR spectrum of the following compound?

Accepted Answer

The answer of How many signals would you expect in...

Question 14

The ¹H NMR spectrum of bromoethane shows a signal at 3.5 ppm when the spectrum is recorded using a 60 MHz spectrometer. Where do you expect to see the signal if a 300 MHz instrument is used instead?

Accepted Answer

The chemical shift in NMR spectroscopy is independent of the spectrometer's frequency. It is a relative measurement and is expressed in parts per million (ppm), so it remains the same regardless of whether a 60 MHz or a 300 MHz instrument is used.

Question 15

Protons H_a and H_b in the following compound are _________.

Accepted Answer

The answer of Protons H_a and H_b in the following...

Question 16

How many signals would you expect in the ¹H NMR spectrum of CH₃OCH₂CH₃?

Accepted Answer

There are three different types of protons in the molecule:
- Protons on the CH groups (S1U1B13, S1U1B12, and S1U1B13): 3 signals
- Protons on the OH group (S1S1P0H): 1 signal
- Protons on the CH2 group (S1U1B0OCHS1U1B12S1U1B0C): 1 signal
Total: 3 + 1 + 1 = 5 signals

Therefore, the correct answer is C) 3.

Question 17

______is used as a reference for recording NMR spectra and is assigned a chemical shift value of zero.

Accepted Answer

The answer of ______is used as a reference for recording...

Question 18

Protons H_a and H_b in the following compound are _________.

Accepted Answer

The answer of Protons H_a and H_b in the following...

Question 19

How many signals would you expect in the ¹H NMR spectrum of (CH₃)₂CHCH₂CH₂CH₃?

Accepted Answer

The molecule contains multiple types of carbon environments: - CH - CH2 (in ₂ and ₃) - CH3 (in CH₃ and CH₂) Each of these environments will produce a separate peak in the NMR spectrum, leading to a total of 5 signals.

Question 20

How many signals would you expect in the ¹H NMR spectrum of the following compound?

Accepted Answer

The answer of How many signals would you expect in...

Quiz 15: Nuclear Magnetic Resonance Spectroscopy

Protons H_a and H_b in the following compound are _________.

Which of the indicated protons in the following compound would appear most upfield in the ¹H NMR spectrum?

Protons H_a and H_b in the following compound are _________.

How many signals would you expect in the ¹H NMR spectrum of the following compound?

Protons H_a and H_b in the following compound are _________.

Protons H_a and H_b in the following compound are _________.

How many signals would you expect in the ¹H NMR spectrum of the following compound?

Which of the indicated protons in the following compound would appear most downfield in the ¹H NMR spectrum?

How many signals would you expect in the ¹H NMR spectrum of CH₃OCH₂CH₂OCH₃?

How many signals would you expect in the ¹H NMR spectrum of the following compound?

How many signals would you expect in the ¹H NMR spectrum of HOCH₂CH₂CH₂CH₂OH?

How many signals would you expect in the ¹H NMR spectrum of the following compound?

How many signals would you expect in the ¹H NMR spectrum of the following compound?

The ¹H NMR spectrum of bromoethane shows a signal at 3.5 ppm when the spectrum is recorded using a 60 MHz spectrometer. Where do you expect to see the signal if a 300 MHz instrument is used instead?

Protons H_a and H_b in the following compound are _________.

How many signals would you expect in the ¹H NMR spectrum of CH₃OCH₂CH₃?

______is used as a reference for recording NMR spectra and is assigned a chemical shift value of zero.

Protons H_a and H_b in the following compound are _________.

How many signals would you expect in the ¹H NMR spectrum of (CH₃) ₂CHCH₂CH₂CH₃?

How many signals would you expect in the ¹H NMR spectrum of the following compound?

Quiz 15: Nuclear Magnetic Resonance Spectroscopy

Protons Ha and Hb in the following compound are _________.

Which of the indicated protons in the following compound would appear most upfield in the 1H NMR spectrum?

Protons Ha and Hb in the following compound are _________.

How many signals would you expect in the 1H NMR spectrum of the following compound?

Protons Ha and Hb in the following compound are _________.

Protons Ha and Hb in the following compound are _________.

How many signals would you expect in the 1H NMR spectrum of the following compound?

Which of the indicated protons in the following compound would appear most downfield in the 1H NMR spectrum?

How many signals would you expect in the 1H NMR spectrum of CH3OCH2CH2OCH3?

How many signals would you expect in the 1H NMR spectrum of the following compound?

How many signals would you expect in the 1H NMR spectrum of HOCH2CH2CH2CH2OH?

How many signals would you expect in the 1H NMR spectrum of the following compound?

How many signals would you expect in the 1H NMR spectrum of the following compound?

The 1H NMR spectrum of bromoethane shows a signal at 3.5 ppm when the spectrum is recorded using a 60 MHz spectrometer. Where do you expect to see the signal if a 300 MHz instrument is used instead?

Protons Ha and Hb in the following compound are _________.

How many signals would you expect in the 1H NMR spectrum of CH3OCH2CH3?

______is used as a reference for recording NMR spectra and is assigned a chemical shift value of zero.

Protons Ha and Hb in the following compound are _________.

How many signals would you expect in the 1H NMR spectrum of (CH3) 2CHCH2CH2CH3?

How many signals would you expect in the 1H NMR spectrum of the following compound?

Protons H_a and H_b in the following compound are _________.

Which of the indicated protons in the following compound would appear most upfield in the ¹H NMR spectrum?

Protons H_a and H_b in the following compound are _________.

How many signals would you expect in the ¹H NMR spectrum of the following compound?

Protons H_a and H_b in the following compound are _________.

Protons H_a and H_b in the following compound are _________.

How many signals would you expect in the ¹H NMR spectrum of the following compound?

Which of the indicated protons in the following compound would appear most downfield in the ¹H NMR spectrum?

How many signals would you expect in the ¹H NMR spectrum of CH₃OCH₂CH₂OCH₃?

How many signals would you expect in the ¹H NMR spectrum of the following compound?

How many signals would you expect in the ¹H NMR spectrum of HOCH₂CH₂CH₂CH₂OH?

How many signals would you expect in the ¹H NMR spectrum of the following compound?

How many signals would you expect in the ¹H NMR spectrum of the following compound?

The ¹H NMR spectrum of bromoethane shows a signal at 3.5 ppm when the spectrum is recorded using a 60 MHz spectrometer. Where do you expect to see the signal if a 300 MHz instrument is used instead?

Protons H_a and H_b in the following compound are _________.

How many signals would you expect in the ¹H NMR spectrum of CH₃OCH₂CH₃?

Protons H_a and H_b in the following compound are _________.

How many signals would you expect in the ¹H NMR spectrum of (CH₃) ₂CHCH₂CH₂CH₃?

How many signals would you expect in the ¹H NMR spectrum of the following compound?