Unit 4- Organic Reactions

Question 1

The addition of hydrogen to an alkane can also be classified as _____.

Answer 1

Reduction

Question 2

Can tertiary alcohols be oxidised?

Answer 2

No

Question 3

The condensation of a carboxylic acid and an amine produces which type of compound?

Answer 3

Amide

Question 4

Describe how to test for a primary alcohol.

Answer 4

Add an ox agent (EG KMNO4) - it will change colour

Question 5

Describe the products of the oxidation of a primary alcohol

Answer 5

Aldehyde then carboxylic acid

Question 6

Describe two different reactions that could be used to produce propan-2-ol

Answer 6

Hydration of propene (+ H2O) Substitution of 2-halopropane (+ NaOH)

Question 7

Desribe a chemical test to distinguish hexane from hexene

Answer 7

Add bromine water, alkene becomes colourless first (without UV light)

Question 8

Determine the products of the hydrolysis of ethyl propanoate

Answer 8

Ethanol and propanoic acid

Question 9

Determine the reactant needed to produce 2- fluoropentane from pent- 2-ene

Answer 9

HF

Question 10

Elimination reactions produce _____ compounds.

Answer 10

Unsaturated

Question 11

Haloalkanes can undergo elimination or substitution when reacting with NaOH. Which conditions promote elimination?

Answer 11

High temp, conc NaOH, ethanol solvent

Question 12

Identfy two reaction types that produce amines

Answer 12

Reduction (of a nitrile) Substitution (of a haloalkane)

Question 13

Identify the class of compound produced when a haloalkane undergoes substitution with ammonia (NH3)

Answer 13

Amine

Question 14

Identify the products of complete combustion.

Answer 14

Water and carbon dioxide

Question 15

Identify the reactant needed to produce hexanenitrile from 1- chloropentane

Answer 15

KCN

Question 16

Identify two differenet products of condensation reactions

Answer 16

Ester + amide

Question 17

Markovnikov’s rule applied to addition reactions with hydrogen halides says that..

Answer 17

the hydrogen atom will be added to the carbon with the greatest number of hydrogen atoms

Question 18

Name the product when 2-chlorobutane reacts with dilute NaOH at room temperature

Answer 18

Butan-2-ol

Question 19

Name the product when ethane reacts with chlorine (in UV light)

Answer 19

chloroethane

Question 20

Name the product when water reacts with but-1-ene

Answer 20

Butan-2-ol (Markovnikov’s rule)

Question 21

Name two common oxidising agents

Answer 21

dichromate (VI) / (Cr2O72-) permanganate / manganate (VII) / (MnO4)-

Question 22

True or false - amides are basic?

Answer 22

False (amines are basic)

Question 23

What colour change is associated with the oxidation of an alcohol with potassium dichromate?

Answer 23

Orange to green

Question 24

What colour would you expect to see when potassium manganate (VII) is combined with a) propan-1- ol and b) methylpropan-2-ol

Answer 24

a) purple -> colourless / brown PPT
b) purple (no change)

Question 25

What is produced when a secondary alcohol is oxidised?

Answer 25

A ketone

Question 26

What two classes of organic compounds react to form an ester?

Answer 26

An alcohol and a carboxylic acid

Question 27

What type of reaction do alkanes undergo?

Answer 27

Substitution

Question 28

Which class undergoes addition?

Answer 28

Alkenes