Alkenes containing 2 to 4 carbon atoms are gases, those containing 5 to 18 carbons are liquids, and those over 18 carbons are solids. Alkenes are insoluble in water but soluble in organic solvents. Their melting and boiling points increase with molecular weight, and branched alkenes have lower boiling points than straight-chain alkenes.

1. Physical properties of
alkenes
For B- Pharm Students
Presented By- Sandhya Punetha

2. Physical properties of alkenes
• Unbranched alkenes containing 2 to 4 carbon atoms ( ethylene, propylene ,butenes)
are gases at room temperature, those containing 5 to 18 carbons are liquids, while
those containing more than 18 carbons are solids.
• They are insoluble in water but are soluble in organic solvents such as ethers,
alcohols and carbon tetrachloride.
• They are lighter than water, has limited density less than 0.8.
• Melting and boiling points of alkene rises with increasing molecular weight.
Further, branched chain alkenes have lower boiling point than straight chain
alkenes.

3. • Alkenes have higher melting points than the alkanes with the same carbon
skeleton due to dipole dipole interaction due to the presence of pi bond.

4. “Failure is when you don’t try”
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