Chem Help

Alllright i have a mid term tomor and i need some help understanding a few things in first year organic chem, any words of wisdom would be much appreciated..
i dont know what diastereomers are,
degree of unsaturation of hydrocarbons,
SN1 and SN2 reactions are,
curvy arrow reactions?

thanks,chris

 
E=MCsquared

do you have like a planner or sometype of passbook, well write a bunch of shit in that and look at it when you go or ask to go to the bathroom when you are taking the test
 
haha good luck getting orgo help on newschoolers. I thought this was going to be about basic chem.. i was wrong
 
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