Unsaturated-They dont have the maximum number of hydrogen attatched to each other.
CnH2n
2
C²H⁴
C³H⁶
C⁴H⁸
C⁵H¹⁰
Ethene
Propene
Butene
Pentene
Ethylene
Haloalkene
Subsitution reaction between alkane and halegeon- One halegeon replaces a hydrogen in the alkane
Bromo-Br
Chloro-Cl
Fluoro-F
Iodo-I
Meth-1 Carbon
Eth-2 Carbon
Prop-3 Carbon
But-4 Carbon
Pent-5 Carbon
Hex-6 Carbon
Colourless
Orange