ALKOHOL & KEISOMERAN

Diagram represents the structural formula of a carbon compound.

Which of the following alcohol reacts with propanoic acid to produce the above compound?

• CH₃OH

• CH₃CH₂OH

• CH₃CH₂CH₂OH

• CH₃CH₂CH₂CH₂OH

Ethanol reacts with ethanoic acid to form ethyl ethanoate.

C₂H₅OH + CH₃COOH → CH₃COOC₂H₅ + H₂O

What is the formula of the ester formed when methanol reacts with butanoic acid, (C₃H₇COOH)?

• C₂H₅COOC₂H₅

• C₃H₇COOC₂H₅

• C₃H₇COOCH₃

• CH₃COOC₃H₇

Diagram shows oxidation process of ethanol.

What can be observed after being heated for 5 minutes?

• No colour change

• All of the ethanol vapourises and the flask becomes dry

• The colour of mixture changes from orange to green

• The mixture in the flask separated into two layers. The upper layer is yellow while the lower layer is green

When liquid R is refluxed with propanoic acid and a few drops of concentrated sulphuric acid, a sweet smelling liquid is formed. Liquid R may be

• propanol

• ethanoic acid

• hexane

• ethyl propanoate

Which formulas represent butane or its isomer?

(1) CH3(CH2)2CH3

(2) CH3CH(CH3)CH3

(3) (CH3)3CH

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

• 1 , 2 and 3

Which structural formula represents an isomer?

• 
• 
• 
• 

A structural isomer of pentane is?

• 2-methyl butane

• 2,2-dimethyl octane

• 1-methyl propane

• 1-methyl pentane

Structural isomers have

• same molecular formula

• different physical and chemical properties.

• Have the same number of elements and atoms

• all of the above

Compounds that are composed of the same number and type of atoms but have them arranged in different ways are ___________.

• isomers

• isotopes

• polymers

• alkanes

Molecules of 1-bromopropane and 2-bromopropane differ in

• molecular formula

• structural formula

• number of carbon atoms per molecule

• number of bromine atoms per molecule