Question

Which one of the following hexachlorocyclohexane is least reactive and which one is most reactive for E2 reactions with a strong base for dehydrohalogenation.

• A. I least &II most
• B. II least &I most
• C. III least &I most
• D. III least &II most

Answer 1

Answer: (B)

II least &I most

Answer 2

$\longrightarrow$$\longrightarrow$No E2 reaction

$\longrightarrow$No E2 reaction because b-hydrogen and leaving

group must not present in anti.