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What are strong base....

What are strong base.

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The correct Answer is:
C
Hint: The reactivity of alkyl halides is in the order `CH_3 gt 1^(@) gt 2^(@) gt 3^@` as the tendency of alkyl halides undergo elimination is `3^@ gt 2^@ gt 1^@` C - Br bond is weaker than C - Cl bond, so C-Br bond is easier to break than C-Cl bond, therefore II reacts faster than III and IV. Vinyl carbocation is resonance stabilized so it reacts faster than n-propyl chloride.
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