Y12 Basic Organic THW1

Choose the best components to answer: What is meant by the term 'homologous series'

• A series of organic compounds with the same general formula

• A series of organic compounds with the same functional group

• Each successive member differs by CH₂

• A series of organic compounds with the same chemical properties

• Each successive member differs by CH₃

What is the general formula for a cycloalkane?

• C_nH_2n-2

• C_nH_2n

• C_nH_2n+2

• C_nH_2n-1

Choose the best explanation for the difference in boiling points for the cycloalkanes in the table

• More carbon atoms means stronger London forces that require more energy to overcome

• More carbon atoms means stronger bonds that require more energy to overcome

• More hydrogen atoms means more hydrogen bonds that require more energy to overcome

• More carbon-hydrogen bonds means stronger permanent dipoles that require more energy to overcome

The C-C-C bond angles in cyclohexane are 109.5 degrees. What is the shape around each carbon atom in cyclohexane?

• trigonal bipyramidal

• octahedral

• trigonal planar

• tetrahedral

The C-C-C bond angles in cyclohexane are 109.5 degrees. Choose components for the best explanation for this bond angle.

• Lone pairs of electrons repel more than bonding pairs

• Electron pairs repel each other

• There are two bonding pairs and two lone pairs around each carbon atom

• There are four bonding pairs around each carbon atom

In the absence of ultraviolet radiation, cyclopropane undergoes an addition reaction with bromine. Suggest the structure of the organic product formed in this reaction.

• CH₂BrCH₂CH₂Br

• CH₂BrCHBrCH₃

• CH₃CBr₂CH₃

• CHBr₂CH₂CH₃

Cyclohexane can be prepared from hexane. Construct the equation for this reaction.

• C₆H₁₄ -> C₆H₁₂ + H₂

• C₆H₁₂ + H₂-> C₆H₁₄

• 2C₆H₆ -> C₁₂H₁₂

• C₆H₁₀ + H₂ -> C₆H₁₂

Suggest one advantage of adding cyclohexane to hexane in petrol

• It burns more efficiently

• It is cheaper

• It releases more energy per mole

• It is safer

What is a stereoisomer?

• A molecule with a left hand and right hand form

• A molecule with the same structural formula as another but a different arrangement of atoms in space

• A molecule with the same molecular formula as another but a different structural formula

• A molecule with the same skeletal formula as another but a different arrangement of hydrogen atoms

Cyclobutane has several unsaturated isomers that are alkenes. Two of these are stereoisomers. Select these two.

• 
• 
• 
•