What will be the correct order of SN2/E2 ratio for the %yield of the product of the following halide?

What will be the correct order of SN2/E2 ratio for the %yield of the product of the following halide? Correct Answer III > IV > II > I

Least hindered halide give fastest SN2 reaction as the hindrance increases. As the hindrance increases, the occurrence of SN2 reaction decreases.

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