U N I T 4 O R G A N I C C H E M I S T R Y T O P I C 1 : P R O P E R T I E S O F O R G A N I C M A T E R I A L S H Y D R O C A R B O N S A L K A N E - carbons chain only containing single bonds ( C-C ) - common formula: �(2�+2) - name: prefix + ane (written as one word) - are saturated hydrocarbons. A L K E N E - carbon chains containing at least one double bond ( C=C) - common formula: �2 - name: prefix + ene (written as one word) - are unsaturated hydrocarbons. A L K Y N E - carbon chains containing at least one triple bond ( �� ) - common formula: �22 - name: prefix + yne (written as one word) - are unsaturated hydrocarbons. I S O M E R S S A M E M O L E C U L A R F O R M U L A, D I F