Sunday, January 27, 2008

IIT JEE Revision - Alkynes - Physical Properties

First three members are gases at room temperature.
The next eight are liquids while the higher ones are solids.

Solubulity: are mostly insoluble in water but are soluble in organic solvents such as petroleum, ether, carbon tetrachlorde. benzene etc.

Melting point
Slightly higher compared to alkanes and alkenes. This is because of linear structure which allows more close packing. The magnitude of attractive forces are higher among them.

Melting points increase with increase in molecular mass among alkynes.

The behaviour is similar to melting point.

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