Chemistry A2 Module 6.3 Foundations

In thin layer chromatography, the (a)   value is a comparison between how far a component has moved compared to the solvent.

In thin layer chromatography, if a component has travelled 1.65cm from the baseline and the solvent has travelled 4.85cm. What is the Rf value?

(a)  

In gas chromatography, the time taken for a component to travel from the inlet to the detector is called what?

(a)  

What tests can identify an aldehyde?

• Fehling's solution

• Aqueous silver nitrate and ethanol

• Tollen's reagent

• Acidified potassium dichromate

What test would identify a ketone?

• Fehling's solution

• Tollen's reagent

• Brady's reagent (2-4-DNP)

• Acidified potassium dichromate

What is the chemical added as an internal standard in NMR?

(a)  

State the unit of chemical shift in NMR:

(a)  

How many peaks will be present in the ¹³C NMR spectra of propan-2-ol?

• 1

• 2

• 3

In Proton NMR, a doublet implies there are how many hydrogens attached to the neighbouring atom?

• 0

• 1

• 2

• 3

In the proton NMR spectra of methyl propanoate (CH₃CH₂COOCH₃), what would you expect to see?

• 2 singlets and a triplet

• 1 singlet, 1 doublet and 1 triplet

• 1 singlet, 1 quartet and 1 triplet

• 2 triplets and 1 doublet