What will be the order of SN2 susceptibility in the following compounds?

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Andrei Rogoza

Susceptibility increase in order CH3F

Arvind Negi

@ andrei thanks for your answering...but why this pattern only.

What's wrong with "pattern" ? Symbols between formulae are U+02C2 MODIFIER LETTER LEFT ARROWHEAD

Order of nucleofuges checked by Jerry March textbook http://files.rushim.ru/books/mechanizms/march6ed.pdf

Sayyed Mahdi Hosseini

the order for SN2 substitution is CH3F

Maria Asuncion Valles

The reason why iodine is the best living group among halogens, is that the C-I bond energy is the smallest of this series, and C-F bond energy is the largest. In this family of compounds, steric hindrance is nule, plays no role.

Americo Lemos

You should also be aware that Iodide is also a very good nucleophile and so in some reactions you may experience complications due to the eventual consequent nucleophilic attack by I-