Question 1

Give one reason why ¹³C NMR is less sensitive than ¹H NMR.

Accepted Answer

The answer of Give one reason why ¹³C NMR is...

Question 2

How many distinct carbon signals are expected in the proton-decoupled ¹³C NMR spectrum of the compound below?

Accepted Answer

The answer of How many distinct carbon signals are expected...

Question 3

An unknown compound,C₄H₁₀O,gave the following proton NMR data: Triplet at 1.13 ppm Quartet at 3.38 ppm What is the structure of the compound?

Accepted Answer

The answer of An unknown compound,C₄H₁₀O,gave the following proton NMR...

Question 4

Deduce the identity of the compound from the data provided. C₅H₁₀O₂: IR (cm^-1): 2950,1740; ¹³C NMR (δ,splitting): 15.8 (q),19.7 (q),68.4 (d),195.3 (s)

Accepted Answer

The answer of Deduce the identity of the compound from...

Question 5

Provide the structure that is consistent with the data below. C₅H₁₂O IR (cm^-1): 3200-3600 (broad),2950 ¹H NMR (δ): 3.4 (2H,s),2.9 (1H,broad s),0.9 (9H,s) ¹³C NMR (δ): 64 (t),39 (s),14 (q)

Accepted Answer

The answer of Provide the structure that is consistent with...

Question 6

Deduce the identity of the following compound from the ¹H NMR spectral data given. C₉H₁₀O₂: δ 2.2 (3H,singlet),5.0 (2H,singlet),7.2 (5H,multilet)(ppm)

Accepted Answer

The answer of Deduce the identity of the following compound...

Question 7

The indicated hydrogens (Ha and Hb)are

Accepted Answer

A) enantiotopic. 
B) diastereotopic. 
C) mesotopic. 
D) isotopic. 
E) none of the above.

Question 8

Give the structure of a compound that has a formula of C6H12O and has a triplet (3H,1.1 ppm),doublet (6H,1.2 ppm),quartet (2H,2.4 ppm),and septet (1H,2.7 ppm)in the 1H NMR spectrum.

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 9

What information does a HETCOR spectrum give?

Accepted Answer

The answer of What information does a HETCOR spectrum give?...

Question 10

Deduce the identity of the following compound from the ¹H NMR spectral data given. C₆H₈O₄ : δ 3.9 (6H,singlet),6.1 (2H,singlet)(ppm)

Accepted Answer

The answer of Deduce the identity of the following compound...

Question 11

Provide the structure that is consistent with the data below. C₆H₁₀ IR (cm^-1): 2950,2230 ¹H NMR (d): 2.0 (1H,septet),1.8 (3H,s),0.9 (6H,d) ¹³C NMR (d): 78 (s),72 (s),45 (d),18 (q),15 (q)

Accepted Answer

The answer of Provide the structure that is consistent with...

Question 12

An unknown compound,C₄H₈Br₂,gave the following proton NMR data: Singlet at 1.97 ppm (6H) Singlet at 3.89 ppm (2H) What is the compound?

Accepted Answer

The answer of An unknown compound,C₄H₈Br₂,gave the following proton NMR...

Question 13

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

Accepted Answer

A) 1 
B) 2 
C) 4 
D) 5 
E) 3

Question 14

Deduce the structure from the data given: C₇H₁₆O; ¹H NMR δ (integration,coupling): 0.9 (9H,s),1.5 (2H,t),3.5 (3H,s),3.8 (2H,t).

Accepted Answer

The answer of Deduce the structure from the data given:...

Question 15

How many signals would you expect to see in the 1H NMR spectrum of the following compound? ClCH2CH2Cl

Accepted Answer

A) 5 
B) 4 
C) 3 
D) 2 
E) 1

Question 16

Which of the following protons gives an NMR signal with the highest chemical shift value (farthest downfield)? (CH3)2CH-O-CH2CH2CH3
 1 2 3 4 5

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 17

H-H coupling is observed in the ¹H NMR spectrum of CH₃CH₂OCH₃ and the signal from the methylene H's does not appear as a single peak.How does this signal appear? Explain in detail what is occurring.

Accepted Answer

The answer of H-H coupling is observed in the ¹H...

Question 18

How many distinct carbon signals are expected in the proton-decoupled ¹³C NMR spectrum of the compound below?

Accepted Answer

The answer of How many distinct carbon signals are expected...

Question 19

Give the integration and splitting pattern for the indicated signals in the 1H NMR spectrum.

Accepted Answer

A) a = 3H,triplet; d = 1H,singlet 
B) a = 2H,triplet; d = 1H,singlet 
C) a = 3H,triplet,d = 1H,singlet 
D) a = 2H,triplet; d = 2H,doublet 
E) a = 3H,triplet; d = 1H,triplet

Question 20

Determine the number of signals for 4-methyl-1-propylbenzene in the 1H NMR spectrum.

Accepted Answer

A) 4 
B) 5 
C) 6 
D) 7 
E) 8

Exam 14: Nmr Spectroscopy

Give one reason why ¹³C NMR is less sensitive than ¹H NMR.

How many distinct carbon signals are expected in the proton-decoupled ¹³C NMR spectrum of the compound below?

An unknown compound,C₄H₁₀O,gave the following proton NMR data: Triplet at 1.13 ppm Quartet at 3.38 ppm What is the structure of the compound?

Deduce the identity of the compound from the data provided. C₅H₁₀O₂: IR (cm^-1): 2950,1740; ¹³C NMR (δ,splitting): 15.8 (q),19.7 (q),68.4 (d),195.3 (s)

Provide the structure that is consistent with the data below. C₅H₁₂O IR (cm^-1): 3200-3600 (broad),2950 ¹H NMR (δ): 3.4 (2H,s),2.9 (1H,broad s),0.9 (9H,s) ¹³C NMR (δ): 64 (t),39 (s),14 (q)

Deduce the identity of the following compound from the ¹H NMR spectral data given. C₉H₁₀O₂: δ 2.2 (3H,singlet),5.0 (2H,singlet),7.2 (5H,multilet)(ppm)

The indicated hydrogens (H_a and H_b) are

Give the structure of a compound that has a formula of C₆H₁₂O and has a triplet (3H,1.1 ppm) ,doublet (6H,1.2 ppm) ,quartet (2H,2.4 ppm) ,and septet (1H,2.7 ppm) in the ¹H NMR spectrum.

What information does a HETCOR spectrum give?

Deduce the identity of the following compound from the ¹H NMR spectral data given. C₆H₈O₄ : δ 3.9 (6H,singlet),6.1 (2H,singlet)(ppm)

Provide the structure that is consistent with the data below. C₆H₁₀ IR (cm^-1): 2950,2230 ¹H NMR (d): 2.0 (1H,septet),1.8 (3H,s),0.9 (6H,d) ¹³C NMR (d): 78 (s),72 (s),45 (d),18 (q),15 (q)

An unknown compound,C₄H₈Br₂,gave the following proton NMR data: Singlet at 1.97 ppm (6H) Singlet at 3.89 ppm (2H) What is the compound?

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

Deduce the structure from the data given: C₇H₁₆O; ¹H NMR δ (integration,coupling): 0.9 (9H,s),1.5 (2H,t),3.5 (3H,s),3.8 (2H,t).

How many signals would you expect to see in the ¹H NMR spectrum of the following compound? ClCH₂CH₂Cl

Which of the following protons gives an NMR signal with the highest chemical shift value (farthest downfield) ? (CH₃) ₂CH-O-CH₂CH₂CH₃ 1 2 3 4 5

H-H coupling is observed in the ¹H NMR spectrum of CH₃CH₂OCH₃ and the signal from the methylene H's does not appear as a single peak.How does this signal appear? Explain in detail what is occurring.

How many distinct carbon signals are expected in the proton-decoupled ¹³C NMR spectrum of the compound below?

Give the integration and splitting pattern for the indicated signals in the ¹H NMR spectrum.

Determine the number of signals for 4-methyl-1-propylbenzene in the ¹H NMR spectrum.

Exam 14: Nmr Spectroscopy

Give one reason why 13C NMR is less sensitive than 1H NMR.

How many distinct carbon signals are expected in the proton-decoupled 13C NMR spectrum of the compound below?

An unknown compound,C4H10O,gave the following proton NMR data: Triplet at 1.13 ppm Quartet at 3.38 ppm What is the structure of the compound?

Deduce the identity of the compound from the data provided. C5H10O2: IR (cm-1): 2950,1740; 13C NMR (δ,splitting): 15.8 (q),19.7 (q),68.4 (d),195.3 (s)

Provide the structure that is consistent with the data below. C5H12O IR (cm-1): 3200-3600 (broad),2950 1H NMR (δ): 3.4 (2H,s),2.9 (1H,broad s),0.9 (9H,s) 13C NMR (δ): 64 (t),39 (s),14 (q)

Deduce the identity of the following compound from the 1H NMR spectral data given. C9H10O2 : δ 2.2 (3H,singlet),5.0 (2H,singlet),7.2 (5H,multilet)(ppm)

The indicated hydrogens (Ha and Hb) are

Give the structure of a compound that has a formula of C6H12O and has a triplet (3H,1.1 ppm) ,doublet (6H,1.2 ppm) ,quartet (2H,2.4 ppm) ,and septet (1H,2.7 ppm) in the 1H NMR spectrum.

What information does a HETCOR spectrum give?

Deduce the identity of the following compound from the 1H NMR spectral data given. C6H8O4 : δ 3.9 (6H,singlet),6.1 (2H,singlet)(ppm)

Provide the structure that is consistent with the data below. C6H10 IR (cm-1): 2950,2230 1H NMR (d): 2.0 (1H,septet),1.8 (3H,s),0.9 (6H,d) 13C NMR (d): 78 (s),72 (s),45 (d),18 (q),15 (q)

An unknown compound,C4H8Br2,gave the following proton NMR data: Singlet at 1.97 ppm (6H) Singlet at 3.89 ppm (2H) What is the compound?

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

Deduce the structure from the data given: C7H16O; 1H NMR δ (integration,coupling): 0.9 (9H,s),1.5 (2H,t),3.5 (3H,s),3.8 (2H,t).

How many signals would you expect to see in the 1H NMR spectrum of the following compound? ClCH2CH2Cl

Which of the following protons gives an NMR signal with the highest chemical shift value (farthest downfield) ? (CH3) 2CH-O-CH2CH2CH3 1 2 3 4 5

H-H coupling is observed in the 1H NMR spectrum of CH3CH2OCH3 and the signal from the methylene H's does not appear as a single peak.How does this signal appear? Explain in detail what is occurring.

How many distinct carbon signals are expected in the proton-decoupled 13C NMR spectrum of the compound below?

Give the integration and splitting pattern for the indicated signals in the 1H NMR spectrum.

Determine the number of signals for 4-methyl-1-propylbenzene in the 1H NMR spectrum.

Give one reason why ¹³C NMR is less sensitive than ¹H NMR.

How many distinct carbon signals are expected in the proton-decoupled ¹³C NMR spectrum of the compound below?

An unknown compound,C₄H₁₀O,gave the following proton NMR data: Triplet at 1.13 ppm Quartet at 3.38 ppm What is the structure of the compound?

Deduce the identity of the compound from the data provided. C₅H₁₀O₂: IR (cm^-1): 2950,1740; ¹³C NMR (δ,splitting): 15.8 (q),19.7 (q),68.4 (d),195.3 (s)

Provide the structure that is consistent with the data below. C₅H₁₂O IR (cm^-1): 3200-3600 (broad),2950 ¹H NMR (δ): 3.4 (2H,s),2.9 (1H,broad s),0.9 (9H,s) ¹³C NMR (δ): 64 (t),39 (s),14 (q)

Deduce the identity of the following compound from the ¹H NMR spectral data given. C₉H₁₀O₂: δ 2.2 (3H,singlet),5.0 (2H,singlet),7.2 (5H,multilet)(ppm)

The indicated hydrogens (H_a and H_b) are

Give the structure of a compound that has a formula of C₆H₁₂O and has a triplet (3H,1.1 ppm) ,doublet (6H,1.2 ppm) ,quartet (2H,2.4 ppm) ,and septet (1H,2.7 ppm) in the ¹H NMR spectrum.

Deduce the identity of the following compound from the ¹H NMR spectral data given. C₆H₈O₄ : δ 3.9 (6H,singlet),6.1 (2H,singlet)(ppm)

Provide the structure that is consistent with the data below. C₆H₁₀ IR (cm^-1): 2950,2230 ¹H NMR (d): 2.0 (1H,septet),1.8 (3H,s),0.9 (6H,d) ¹³C NMR (d): 78 (s),72 (s),45 (d),18 (q),15 (q)

An unknown compound,C₄H₈Br₂,gave the following proton NMR data: Singlet at 1.97 ppm (6H) Singlet at 3.89 ppm (2H) What is the compound?

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

Deduce the structure from the data given: C₇H₁₆O; ¹H NMR δ (integration,coupling): 0.9 (9H,s),1.5 (2H,t),3.5 (3H,s),3.8 (2H,t).

How many signals would you expect to see in the ¹H NMR spectrum of the following compound? ClCH₂CH₂Cl

Which of the following protons gives an NMR signal with the highest chemical shift value (farthest downfield) ? (CH₃) ₂CH-O-CH₂CH₂CH₃ 1 2 3 4 5

H-H coupling is observed in the ¹H NMR spectrum of CH₃CH₂OCH₃ and the signal from the methylene H's does not appear as a single peak.How does this signal appear? Explain in detail what is occurring.

How many distinct carbon signals are expected in the proton-decoupled ¹³C NMR spectrum of the compound below?

Give the integration and splitting pattern for the indicated signals in the ¹H NMR spectrum.

Determine the number of signals for 4-methyl-1-propylbenzene in the ¹H NMR spectrum.