Which statements about the reaction of ethene with steam are correct? 1 The product has a higher molecular mass than ethane. 2 The product reacts with aqueous bromine. 3 The number of electrons shared between carbon atoms decreases. 4 The reaction produces an alcohol and hydrogen.

1 and 2

1 and 3

2 and 4

3 and 4

Chemistry

IGCSE&ALevel

CAIE

Exam No：0620_m24_qp_22 Year：2024 Question No：37

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