Less used data (1 byte) in memory address holding 4 bytes [closed]

Question

I need to store two distinct variables of 1 byte size in memory.

My memory system stores 4 bytes at one address; therefore, you cannot address byte 3 directly, and you have to logically access it after all 4 bytes are fetched of that address (correct me if I'm wrong please).

So, if I assign the following two variables: char var1 = "a" and char var2 = "b",

Will my system store them in memory at two different addresses?

Will 3 bytes in each of those addresses be useless (i.e., will the two variables occupy 8 bytes of memory)?