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Trans alkenes have higher melting points (symmetrical) and lower boiling points (less likely to be polar).

SP3 carbons donate electrons to SP2 carbons - orbitals more s character, closer to nucleus, more stable.

*chain length; increase
   -bioling point
   -melting point
   -density

*branching; decrease
   -boiling point
   -density

*melting point and branching - determined by how symmetrical the molcule is; packing density. Easier to stack, more dense, higher melting point.

* higher boiling points than alkenes
* more polarized than alkenes
* internal alkynes BP > terminal alkynes BP
* terminal alkynes fairly acidic (PKA~25) due to high s character (50%), stabilize negative charge.