Table 4.2 shows the names, formulae and boiling points of ethene, propene, butene and pentene. Table 4.2 Use the information in Table 4.2 to answer these questions. (i) Name the homologous series that includes ethene, propene, butene and pentene. ................................................................................................................................... (ii) Deduce the general formula of this homologous series. ................................................................................................................................... (iii) State the trend in the boiling point of this homologous series as the number of carbon atoms increases. ...................................................................................................................................

Chemistry

IGCSE&ALevel

CAIE

Exam No：0620_w24_qp_32 Year：2024 Question No：4(d)

Answer:

11.5.1. State that the bonding in alkenes includes a double carbon–carbon covalent bond and that alkenes are unsaturated hydrocarbons

11.5.2. Describe the manufacture of alkenes and hydrogen by the cracking of larger alkane molecules using a high temperature and a catalyst

11.5.3. Describe the reasons for the cracking of larger alkane molecules

11.5.4. Describe the test to distinguish between saturated and unsaturated hydrocarbons by their reaction with aqueous bromine

11.5.5. State that in an addition reaction only one product is formed

11.5.6.1. bromine or aqueous bromine

11.5.6.2. hydrogen in the presence of a nickel catalyst

11.5.6.3. steam in the presence of an acid catalyst and draw the structural or displayed formulae of the products