Lab Final Exam

Question 1

method for separating and purifying organic compounds based on their differential solubility in different solvents

Answer 1

two-base extraction

Question 2

Recrystallization is used for:

Answer 2

solids only

Question 3

Distillation is used for:

Answer 3

Liquids only

Question 4

Chromatography is used for:

Answer 4

Solids or liquids

Question 5

The best recrystallizing solvent will:

Answer 5

dissolve compound at BP but not when solution is cold

Question 6

method to purify solid compounds by exploiting differences in solubility at different temperatures, resulting in the production of high-quality crystals of the desired compound

Answer 6

recrystallization

Question 7

recrystallizing solvent for benzoic acid

Answer 7

water

Question 8

recrystallizing solvent for napthalene

Answer 8

ethanol

Question 9

use simple distillation when temperature difference is:

Answer 9

higher than 40 degrees

Question 10

used for separating and analyzing complex mixtures of components based on their differential partitioning between a stationary phase and a mobile gas phase.

Answer 10

gas chromatography

Question 11

method for separating and analyzing components in a mixture using a thin layer of stationary phase on a plate and analyzing their Rf (distance of dots traveled) value

Answer 11

Thin Layer Chromatography

Question 12

Rf =

Answer 12

distance traveled by the spot / distance traveled by the solvent front

Question 13

In column chromatography, the mobile phase is a _____ solvent that flows through the column

Answer 13

liquid

Question 14

In column chromatography, the stationary phase is packed into a column as a ________

Answer 14

solid

Question 15

SN2 experiment

Answer 15

Preparation of 1-bromobutane

Question 16

SN1 experiment

Answer 16

Preparation of 2-Chloro-2-Methylbutane

Question 17

E1 experiment

Answer 17

Dehydration of 4-methyl-2-pentanol

Question 18

Alternative reagent for oxidizing carbon

Answer 18

NaOCl (Bleach)

Question 19

E2 experiment

Answer 19

Base promoted elimination 2-bromo-2-methylbutane

Question 20

performed to detect the presence of unsaturation, such as carbon-carbon double or triple bonds, in organic compounds

Answer 20

bromine test

Question 21

a specific test used to detect the presence of phenols, which are compounds containing a hydroxyl group (-OH) attached to an aromatic ring

Answer 21

Bayer test