Question 1

Which of the following statements about¹³C NMR isnot true?

Accepted Answer

13C NMR can detect all types of carbon atoms, not just those bonded to hydrogen atoms. This includes quaternary carbons, which have no hydrogen atoms attached.

Question 2

How could spectroscopy be used to distinguish between the following compounds?

Accepted Answer

B

Question 3

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 94 and shows prominent peaks in its IR spectrum at 3600-3200 and 1600 cm^-1?

Accepted Answer

The molecular ion peak at mass 94 indicates the compound has a molecular mass of 94. The IR peaks at 3600-3200 cm^-1 suggest an OH group, and the peak at 1600 cm^-1 is characteristic of a benzene ring.

Question 4

Examine the IR below and classify the compound.

Accepted Answer

The answer of Examine the IR below and classify the...

Question 5

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 104 and shows prominent peaks in its IR spectrum at 3200-2850 cm^-1?

Accepted Answer

The answer of Which of the following statements is (are)...

Question 6

You are given a bottle of an organic liquid and told it must be either cyclohexane or 1-hexene. Which of the following statements is (are) true about these two compounds?

Accepted Answer

The answer of You are given a bottle of an...

Question 7

Which of the following statements is (are) accurate about the IR spectrum of compounds I, II, and III below?

Accepted Answer

The answer of Which of the following statements is (are)...

Question 8

Consider the three organic compounds drawn below. Which of the following statements is (are) true about the IR spectra of I, II, and III?

Accepted Answer

The answer of Consider the three organic compounds drawn below....

Question 9

Which of the following statement(s) is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 69 and shows a prominent peak in its IR spectrum at 2250 cm^-1?

Accepted Answer

The IR peak at 2250 cm^-1 indicates the presence of a cyano or alkyne group. The molecular ion peak at mass 69 suggests a molecular mass of 69, not 70.

Question 10

Which of the following statements is (are) true about the IR spectrum of the compound drawn below?

Accepted Answer

The answer of Which of the following statements is (are)...

Question 11

Which of the following statements is (are) true about a compound that has molecular ion peaks in its mass spectrum at mass 170 and 172 and shows prominent peaks in its IR spectrum at 3150-3000 and 1600 cm^-1?

Accepted Answer

The presence of molecular ion peaks at mass 170 and 172 suggests the compound contains a halogen, specifically chlorine, due to the natural isotopic abundance of Cl-35 and Cl-37. The IR spectrum peaks do not directly indicate impurity or the presence of an OH group; instead, the 3150-3000 cm^-1 range suggests C-H stretching in alkenes or aromatics, and the 1600 cm^-1 peak suggests C=C stretching, not necessarily an OH group or impurity.

Question 12

A compoundX has a molecular ion peak in its mass spectrum at m/z 136. What information does this tell us aboutX?

Accepted Answer

The molecular ion peak in a mass spectrum represents the mass of the molecule, indicating that compound X has a molecular mass of 136.

Quiz 29: Spectroscopy : Mass Spectrometry, Infrared Spectroscopy, and Nuclear Magnetic Resonance Spectroscopy

Which of the following statements about13C NMR isnot true?

How could spectroscopy be used to distinguish between the following compounds?

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 94 and shows prominent peaks in its IR spectrum at 3600-3200 and 1600 cm-1?

Examine the IR below and classify the compound.

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 104 and shows prominent peaks in its IR spectrum at 3200-2850 cm-1?

You are given a bottle of an organic liquid and told it must be either cyclohexane or 1-hexene. Which of the following statements is (are) true about these two compounds?

Which of the following statements is (are) accurate about the IR spectrum of compounds I, II, and III below?

Consider the three organic compounds drawn below. Which of the following statements is (are) true about the IR spectra of I, II, and III?

Which of the following statement(s) is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 69 and shows a prominent peak in its IR spectrum at 2250 cm-1?

Which of the following statements is (are) true about the IR spectrum of the compound drawn below?

Which of the following statements is (are) true about a compound that has molecular ion peaks in its mass spectrum at mass 170 and 172 and shows prominent peaks in its IR spectrum at 3150-3000 and 1600 cm-1?

A compoundX has a molecular ion peak in its mass spectrum at m/z 136. What information does this tell us aboutX?

Which of the following statements about¹³C NMR isnot true?

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 94 and shows prominent peaks in its IR spectrum at 3600-3200 and 1600 cm^-1?

Which of the following statements is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 104 and shows prominent peaks in its IR spectrum at 3200-2850 cm^-1?

Which of the following statement(s) is (are) true about a compound that has a molecular ion peak in its mass spectrum at mass 69 and shows a prominent peak in its IR spectrum at 2250 cm^-1?

Which of the following statements is (are) true about a compound that has molecular ion peaks in its mass spectrum at mass 170 and 172 and shows prominent peaks in its IR spectrum at 3150-3000 and 1600 cm^-1?