Answer:
b. The shorter the half-life, the more dangerous the radioisotope.
<h2>QUESTION:- Which functional group is found in an ester?</h2>
ESTER IS THE COMPOUND IN WHICH OH GROUP IS REPLACED BY THE (O) in the substitution reaction.
so common formula of ester ->
RCOOR'
IN WHICH R AND R' ARE CARBON CHAINS
It may just be my internet but the picture is just white. maybe try reposting this..?