Consider the following compounds I to IV with respect to their `S_(N)2` reacrtivity with a given nucelophile `{:(CH_(3)CH_(2)Br,CH_(3)CH_(2)CH_(2)Br),(" "I," "II),((CH_(3))_(2)CHCH_(2)Br,(CH_(3))_(3)C CH_(2)Br),(" "III," "IV):}`

Options

A. `IV gt III gt II gt I`
B. `I gt IV gt III gt II`
C. ` IV gt I gt II gt III`
D. ` I gt II gt III gt IV`

Answer

D

Explanation

Rate of `SN_(2)` reaction `prop(1)/("steric hindrance")`
`(i)gt(ii)gt(iii)gt(iv)`