Chemistry 5070 · O Level · Alkanes

Alkanes — practice question

Methylpropane is a saturated hydrocarbon, and its structure is shown.
(a(i))[2]

One of the products formed has a relative molecular mass of $127$. State its molecular formula. Suggest a structure for this compound. Show all atoms and all bonds.

(a(ii))[2]

Another product has a percentage composition by mass of $29.7\%$ carbon; $4.3\%$ hydrogen; $65.9\%$ chlorine. Determine the molecular formula for this compound.

(a(iii))[1]

One molecule of methylpropane reacts with five molecules of chlorine to form a compound. Write the molecular formula for this compound.

(b(i))[1]

What does the term isomerism mean?

(b(ii))[1]

What does the term hydrocarbons mean?

(b(iii))[1]

How do an unsaturated hydrocarbon and a saturated hydrocarbon differ?

(b(iv))[2]

Describe a chemical test that can be used to tell unsaturated hydrocarbons from saturated hydrocarbons.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: the molecular formula is C₄H₈Cl₂

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