Chemistry 0620 · IGCSE · Alcohols

Alcohols — practice question

Alcohols form a homologous series of organic compounds that share the same general formula.
(a)[1]

What name is given to any family of organic molecules that has the same general formula and similar chemical properties?

(b)[1]

Give the general formula for alcohols.

(c(i))[2]

Name the reagent and state the conditions required to turn propene into propan-1-ol.

(c(ii))[2]

Write the chemical equation for the complete combustion of propan-1-ol.

(d(i))[2]

Complete the diagram so that it shows part of a carbohydrate polymer formed from the simple sugar shown.

(d(ii))[1]

Name the chemical process that takes place when a carbohydrate polymer is broken into simple sugars.

(d(iii))[1]

What conditions are needed for this process to happen?

(e(i))[1]

What is the name for the substance used to show the positions of the simple sugars on the chromatogram?

(e(ii))[1]

The student found the $R_f$ value of a spot on the chromatogram. Complete the expression for the $R_f$ value of the spot.

(e(iii))[1]

How could a student identify a simple sugar using its $R_f$ value?

(e(iv))[1]

Sometimes the chromatogram produced cannot identify every substance in a mixture. Explain why this can happen.

Worked solution & mark scheme

This 14-mark question has a full step-by-step worked solution and mark scheme. One marking point: the homologous series

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