The reactivity of ethyl chloride is
[KCET 1986]
More or less equal to that of benzyl chloride
More than that of benzyl chloride
More or less equal to that of chlorobenzene
Less than that of chlorobenzene
The reactivities of methyl chloride, propyl chloride and chlorobenzene are in
the order
[KCET 1988]
Insulin is a protein which plays the role of