Yes, SunKist a fruity soda drink does contain caffeine. A 12 fl oz serving contains 41mg of caffeine.
No. Like most root beers, IBC root beer does not contain caffeine. IBC root beer was made as an alternative to alcohol and the colas.
Yes, Lipton Ice Tea contains caffeine. The amount of caffeine depends on the particular variety of Lipton Ice Tea and the length of time it has been brewed.
The amount of caffeine in a serving of tea is partly determined by the time the tea has been left to brew.
Please note decaffeinated forms of Lipton Ice Tea may also contain traces of caffeine.
The following tables show the amount of caffeine per Lipton Iced Tea product. These figures are based from one tea bag being brewed between 2 to 3.5 minutes.
|Green Tea With Honey||9|
Diet Coke contains 47mg of caffeine per 12 ounces (355ml) as does Diet Coke With Lime.
Classic Coca-Cola, Coca-Cola Zero, and Coco-Cola Cherry each contain 37mg of caffeine per 12 ounces.
The caffeine in soda varies between different brands. For example, a 12 ounce serving of Coco-Cola contains 37mg, whilst the same volume of Mountain Dew contains 54mg. As a 6oz serving of regular coffee, instant or brewed, may be between 70mg -100mg, in general more soda would need to be consumed to match the caffeine levels of a coffee drinker.
Therefore, to answer the question, 'how addictive is the caffeine in soda?', the answer for a typical serving would be, 'less than that of coffee as it contains less caffeine'.
The answer really comes down to the type and brand of coffee, and how much is consumed.
Generally, for a typical serving, coffee, instant or brewed, contains more caffeine than espresso coffee.
A serving of espresso coffee is about 1oz; much less than a typical 6oz serving of regular coffee.
As a guide, a 1oz serving of espresso coffee will contain 40mg of caffeine, much lower than the 70mg of caffeine from a 6oz serving of instant coffee, or 100mg of caffeine from a 6oz serving of brewed coffee. 
However there are exceptions to this. For example a one ounce serving of Starbucks Express coffee contains up to 75mg of caffeine.
Also, volume for volume, espresso coffee contains much higher levels of caffeine compared to instant or brewed coffee.