What is the product of the reaction between hex-3-ene and steam
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Reactions of alkenes
Like the alkanes, the alkenesundergo combustion. However, alkenes are less likely to combust completely, so they tend to burn in air with a smoky flame due to incomplete combustion.
Addition reactions of alkenes
The functional group, C=C, allows alkenes to undergo addition reactions. For example, ethene reacts with bromine to form 1,2-dibromoethane:
CH2=CH2 + Br2 → CH2BrCH2Br
It is easier to see what happens using structures with all their covalent bonds:

The reaction is an ‘addition’ reaction because one moleculecombines with another molecule, forming one larger molecule and no other products.
Alkanes cannot take part in addition reactions.
Worked example
Propene, CH3CH=CH2, reacts with bromine. Predict the structure of the product formed.
The structure will be: CH3CHBrCH2Br.
Like the alkanes, the alkenesundergo combustion. However, alkenes are less likely to combust completely, so they tend to burn in air with a smoky flame due to incomplete combustion.
Addition reactions of alkenes
The functional group, C=C, allows alkenes to undergo addition reactions. For example, ethene reacts with bromine to form 1,2-dibromoethane:
CH2=CH2 + Br2 → CH2BrCH2Br
It is easier to see what happens using structures with all their covalent bonds:

The reaction is an ‘addition’ reaction because one moleculecombines with another molecule, forming one larger molecule and no other products.
Alkanes cannot take part in addition reactions.
Worked example
Propene, CH3CH=CH2, reacts with bromine. Predict the structure of the product formed.
The structure will be: CH3CHBrCH2Br.
Answered by
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structure: CH3CHBrCH2Br
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