Alkynes are hydrocarbons that contain one triple C≡C bond. Like alkenes, alkynes take part in addition reactions. A saturated compound can be formed. For example, ethyne, H–C≡C–H, reacts with an excess of hydrogen to form ethane. Propyne, C₃H₄, undergoes an addition reaction with an excess of hydrogen bromide in two stages. Markovnikov's rule applies to the addition of HBr at each stage. What is the main product obtained when propyne reacts with an excess of hydrogen bromide?

Which compound may be synthesised from an alkene, with formula C4H8, by an addition reaction?

A molecule of hexane can be cracked in a number of different ways. Three compounds are listed. 1 C3H8 2 C4H8 3 C5H12 …

The products obtained by cracking an alkane, X, are methane, ethene and propene. The mole fraction of ethene in the p…

Which compound exhibits both cis-trans and optical isomerism?

In many countries plastic waste is collected separately and sorted. Some of this is incinerated to provide heat for p…

Polymerisation of 1,1-dichloroethene produces a dense, high melting point substance that does not allow gases to pass…