Salad Quiz 15

The systematic name for the molecule shown is

• 2-ethyl-3-methyl-3-pentene
• octene
• 3,4-dimethyl-2-hexene
• 3-methyl-4-thyl-2-pentene

The molecule drawn is the local anesthetic, ethyl-aminobenzoate. The functional groups in this molecule are

• amine and carboxy
• amine, hydroxy and carboxy
• amine and ester
• carboxy and ester

The combination of analytical techniques best suited to the separation and identification of esters used as flavourings of ice-cream is

• UV-visible spectroscopy and nuclear magnetic resonance (NMR) spectroscopy
• thin-layer chromatography and infra-red (IR) spectroscopy
• high-performance liquid chromatography (HPLC) and NMR spectroscopy
• gas chromatography (GC) and UV-visible spectroscopy

The structure of 2-chloropropane and propan-2-ol are analysed separately using low resolution nuclear magnetic resonance spectroscopy (NMR). Which of the following statements best describes the ¹H NMR spectra produced for each of the molecules?

• The spectra for 2-chloropropane and propan-2-ol are identical in appearance.
• The spectra for 2-chloropropane and propan-2-ol each have two main peaks.
• The spectrum for 2-chloropropane has two main peaks whereas the spectrum for propan-2-ol has three main peaks.
• The spectrum for 2-chloropropane has three main peaks whereas the spectrum for propan-2-ol has four main peaks.

Which one of the following compounds will include absorption bands in the infra-red spectrum at about 1700 cm^-1 and 2600 cm^-1?

• pentane
• pentan-2-ol
• pentanoic acid
• pent-2-ene

When a molecule absorbs radio waves during nuclear magnetic resonance spectroscopy (NMR) this is most likely to lead to

• the molecule moving to a higher vibrational energy level
• a deflection in the path taken by the molecule when it is travelling at high speeds
• an electron being promoted from a lower energy level to a higher energy level
• a change in the spin state of nucleons

The diagram shown depicts a possible reaction pathway for producing an ester which has a distinctly pineapple odour. 
Which of the following statements with respect to this pathway is NOT correct?

• X and Y react together in a condensation reaction in the presence of an acid catalyst.
• Chloroethane is converted to X in a sbustitution reaction.
• 1-propanol is converted to Y in a redox reaction using Cu as the oxidising agent.
• The conversion of propene to 1-propanol is an addition reaction.

A simplified diagram of the phosphoric acid fuel cell (PAFC), and their half-reactions are shown. The cell operates at 190^oC using an electrolyte of liquid phosphoric acid.
During operation of the PAFC, electrode I is

• positively charged, and the pH near the electrode will increase
• positively charged, and the pH near the electrode will decrease
• negatively charged, and the pH near the electrode will increase
• negatively charged, and the pH near the electrode will decrease

The diagram shown depicts a possible reaction pathway for producing an ester which has a distinctly pineapple odour. 
Comparison of the ¹³C NMR spectra and low resolution ¹H NMR of compound Y would show?

• More peaks on the ¹³C NMR spectrum
• Fewer peaks on the ¹³C NMR spectrum.
• The same number of peaks on both spectra.
• TMS at a lower chemical shift on the ¹H spectrum.

The diagram shown depicts a possible reaction pathway for producing an ester which has a distinctly pineapple odour. 
How many of the organic compounds in this reaction pathway would be expected to show a strong absorption band between 3200 and 3550 cm^-1 in their IR spectra

• 1
• 2
• 3
• 4