0

The 13C spectrum of which isomer of C6H14 has lines with three distinct chemical shifts?

hexane

2-methylpentane

3-methylpentane

2,3-dimethylbutane

A

The 13C spectrum of which isomer of C6H14 has lines with three distinct chemical shifts?
Please select one option: (A), (B), (C), or (D).

(A) hexane
(B) 2-methylpentane
(C) 3-methylpentane
(D) 2,3-dimethylbutane

<bos>The 13C spectrum of which isomer of C6H14 has lines with three distinct chemical shifts?
Please select one option: (A), (B), (C), or (D).

(A) hexane
(B) 2-methylpentane
(C) 3-methylpentane
(D) 2,3-dimethylbutane

The correct answer is (C) 3

1

The Rydberg equation v = R_H(1/n_1^2 - 1/n_2^2) accurately predicts the UV-visible emission spectrum of the hydrogen atom. A form of the Rydberg equation may also be used to predict the UV-visible emission for all of the following EXCEPT

hydride ion, H−

deuterium atom, D

tritium atom, T

helium cation, He+

A

The Rydberg equation v = R_H(1/n_1^2 - 1/n_2^2) accurately predicts the UV-visible emission spectrum of the hydrogen atom. A form of the Rydberg equation may also be used to predict the UV-visible emission for all of the following EXCEPT
Please select one option: (A), (B), (C), or (D).

(A) hydride ion, H−
(B) deuterium atom, D
(C) tritium atom, T
(D) helium cation, He+

<bos>The Rydberg equation v = R_H(1/n_1^2 - 1/n_2^2) accurately predicts the UV-visible emission spectrum of the hydrogen atom. A form of the Rydberg equation may also be used to predict the UV-visible emission for all of the following EXCEPT
Please select one option: (A), (B), (C), or (D).

(A) hydride ion, H−
(B) deuterium atom, D
(C) tritium atom, T
(D) helium cation, He+

The correct answer is (B) Deuterium

2

Reduction of D-xylose with NaBH4 yields a product that is a

racemic mixture

single pure enantiomer

mixture of two diastereomers in equal amounts

meso compound

D

Reduction of D-xylose with NaBH4 yields a product that is a
Please select one option: (A), (B), (C), or (D).

(A) racemic mixture
(B) single pure enantiomer
(C) mixture of two diastereomers in equal amounts
(D) meso compound

<bos>Reduction of D-xylose with NaBH4 yields a product that is a
Please select one option: (A), (B), (C), or (D).

(A) racemic mixture
(B) single pure enantiomer
(C) mixture of two diastereomers in equal amounts
(D) meso compound

The correct answer is (C) mixture of

3

Calculate the polarization of a proton in a magnetic field of 335 mT and 10.5 T at 298 K.

6.345 x 10^-4 at 0.335 T; 9.871 x 10^-5 at 10.5 T

0.793 x 10^-4 at 0.335 T; 6.931 x 10^-7 at 10.5 T

1.148 x 10^-6 at 0.335 T; 3.598 x 10^-5 at 10.5 T

4.126 x 10^-3 at 0.335 T; 2.142 x 10^-6 at 10.5 T

D

Calculate the polarization of a proton in a magnetic field of 335 mT and 10.5 T at 298 K.
Please select one option: (A), (B), (C), or (D).

(A) 6.345 x 10^-4 at 0.335 T; 9.871 x 10^-5 at 10.5 T
(B) 0.793 x 10^-4 at 0.335 T; 6.931 x 10^-7 at 10.5 T
(C) 1.148 x 10^-6 at 0.335 T; 3.598 x 10^-5 at 10.5 T
(D) 4.126 x 10^-3 at 0.335 T; 2.142 x 10^-6 at 10.5 T

<bos>Calculate the polarization of a proton in a magnetic field of 335 mT and 10.5 T at 298 K.
Please select one option: (A), (B), (C), or (D).

(A) 6.345 x 10^-4 at 0.335 T; 9.871 x 10^-5 at 10.5 T
(B) 0.793 x 10^-4 at 0.335 T; 6.931 x 10^-7 at 10.5 T
(C) 1.148 x 10^-6 at 0.335 T; 3.598 x 10^-5 at 10.5 T
(D) 4.126 x 10^-3 at 0.335 T; 2.142 x 10^-6 at 10.5 T

The correct answer is (A) 6

4

The anhydride of Ba(OH)2 is

BaH2

BaOH

Ba

BaO

D

The anhydride of Ba(OH)2 is
Please select one option: (A), (B), (C), or (D).

(A) BaH2
(B) BaOH
(C) Ba
(D) BaO

<bos>The anhydride of Ba(OH)2 is
Please select one option: (A), (B), (C), or (D).

(A) BaH2
(B) BaOH
(C) Ba
(D) BaO

The correct answer is (B) BaOH

5

A 1 M solution of TEMPO in chloroform at room temperature shows broader EPR spectrum than that of a 1 mM solution. Which sentence describes this phenomenon most accurately?

in the more concentrated solution, the lines are broadened due to the dipole-dipole interaction between the TEMPO molecules

in the more concentrated solution, the lines are broadened by the slow tumbling of TEMPO molecules

in the more concentrated solution, the lines are broadened due to the exchange interaction between the TEMPO molecules

in the more concentrated solution, the lines are broadened by the hyperfine interaction between the TEMPO molecules

C

A 1 M solution of TEMPO in chloroform at room temperature shows broader EPR spectrum than that of a 1 mM solution. Which sentence describes this phenomenon most accurately?
Please select one option: (A), (B), (C), or (D).

(A) in the more concentrated solution, the lines are broadened due to the dipole-dipole interaction between the TEMPO molecules
(B) in the more concentrated solution, the lines are broadened by the slow tumbling of TEMPO molecules
(C) in the more concentrated solution, the lines are broadened due to the exchange interaction between the TEMPO molecules
(D) in the more concentrated solution, the lines are broadened by the hyperfine interaction between the TEMPO molecules

<bos>A 1 M solution of TEMPO in chloroform at room temperature shows broader EPR spectrum than that of a 1 mM solution. Which sentence describes this phenomenon most accurately?
Please select one option: (A), (B), (C), or (D).

(A) in the more concentrated solution, the lines are broadened due to the dipole-dipole interaction between the TEMPO molecules
(B) in the more concentrated solution, the lines are broadened by the slow tumbling of TEMPO molecules
(C) in the more concentrated solution, the lines are broadened due to the exchange interaction between the TEMPO molecules
(D) in the more concentrated solution, the lines are broadened by the hyperfine interaction between the TEMPO molecules

The correct answer is (A) in the