Investigate, write equations and construct models to represent the reactions of unsaturated hydrocarbons when added to a range of chemicals

Organic Chemistry > Products of Reactions Involving Hydrocarbons >

Reaction with Hydrogen (H₂)

• Alkenes participate in an addition reaction with Hydrogen (known as hydrogenation). The double bonds between the carbon atoms break and hydrogen atoms are added in the free bonds.

• Alkynes too give similar Hydrogenation reaction. The only difference is that since alkynes have triple bonds and only one of the bonds is broken.

Reaction with Halogens (X₂)

• When halogens react with Alkenes the C=C breaks and the halogens are added in the free bonds.

• Alkynes also give similar reactions and the halogens replace a one bond of the triple bonds.

Reaction with Hydrogen Halides (HX)

• Alkenes react with hydrogen halides as follows:

• Alkynes give the following reaction:

Reaction with Water (H₂O)

• In presence of high amount of acid which has catalytic effects, Alkenes react with water to form alcohol.

Reference image for reaction:

• Alkynes react with water in presence of acid and mercuric sulphate. The product of hydration of most alkynes are ketones.