Chemistry 0620 · IGCSE · Formulae, functional groups and terminology

Formulae, functional groups and terminology — practice question

Alkynes form a homologous series of unsaturated hydrocarbons, and every member contains a C≡C triple bond.
(a)[2]

Complete the table that gives details of the first three alkynes.

(b)[2]

Complete the dot-and-cross diagram to show the electron arrangement in a molecule of ethyne, H-C≡C-H, and include only outer shell electrons.

(c(i))[2]

Give two further characteristics of members of a homologous series.

(c(ii))[1]

Use the information shown in the table in (a) to work out the general formula of alkynes.

(d)[2]

Alkynes are unsaturated. Describe a test that shows unsaturation.\ntest\nresult

(e(i))[2]

Name an oxidising agent that can be used to oxidise ethanol to ethanoic acid.

(e(ii))[1]

Draw the structure of ethanoic acid, showing every atom and every bond.

(f(i))[2]

Name this ester and draw its structure, showing every atom and every bond.\nname of the ester\nstructure of the ester

(f(ii))[1]

Name another ester whose molecular formula is C$_4$H$_8$O$_2$.

(g(i))[1]

What type of polymerisation is used in the manufacture of polyesters?

(g(ii))[1]

Name a polyester.

Worked solution & mark scheme

This 17-mark question has a full step-by-step worked solution and mark scheme. One marking point: Formula: C₄H₆

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI