Alkanes Quiz

Why do long chain alkanes have higher boiling points compared to spherical shaped branched alkanes?

• They have weaker London forces.

• They have a larger surface area for contact.

• They have fewer electrons.

• They have lower bond enthalpies.

What is the shape around the carbon atom in saturated hydrocarbons?

• Linear

• Trigonal planar

• Tetrahedral

• Bent

What type of hydrocarbons are produced from catalytic cracking?

• Only straight chain alkanes

• Branched and cyclic alkanes and aromatic hydrocarbons

• Only aromatic hydrocarbons

• Only branched alkanes

Why do branched and cyclic hydrocarbons have a higher octane number?

• They burn less cleanly

• They burn more cleanly

• They are less stable

• They are more reactive

What is a consequence of incomplete combustion in terms of energy?

• Produces more energy per mole

• Produces less energy per mole

• Produces the same energy per mole

• Produces no energy

What is the main environmental concern associated with carbon monoxide?

• It is a greenhouse gas

• It contributes to acid rain

• It is toxic and can cause death

• It causes ozone depletion

In the propagation step, what does the chlorine free radical remove from methane?

• A chlorine atom

• A hydrogen atom

• A carbon atom

• An oxygen atom

What is the role of UV light in the initiation step?

• It acts as a catalyst

• It supplies energy to break bonds

• It absorbs free radicals

• It cools the reaction

What type of reaction is the substitution of alkanes with halogens?

• Addition reaction

• Substitution reaction

• Elimination reaction

• Redox reaction

What is the weakest bond that is broken in the initiation step?

• C-H bond

• C-C bond

• Cl-Cl bond

• H-H bond