Answer :
The reactivity series according to SN1 reactions is as follows: 2-iodo-2-methylpentane > 2-bromo-2-methylpentane > 2-chloro-2-methylpentane > 2-chloro-2-methylpentane.
In this above case, the Sn1 reaction would form a carbocation. So, the molecule will be more reactive if will generate a very stable carbocation. We have to remember that the tertiary carbocations are the more stable ones. Keeping this in mind, 3-chloropentane would be the least reactive molecules of all.
Then to identify which one is more reactive among the other ones, we must check the leaving group. In this given case, all the atoms are halogens, so if we have a larger atom then the leaving group would leave more easily.
Keeping this his in mind the larger atom would be I, then Br and finally Cl, therefore, the 2-iodo-2-methylpentane would be the more reactive one.
The given question is incomplete and the complete question is given as,
Rank the following alkyl halides from most reactive to least reactive in an SN1 reaction: 2-bromo-2-methylpentane, 2-chloro-2-methylpentane, 3-chloropentane, and 2-iodo-2-methylpentane. Rank the alkyl halides from most reactive to least reactive. To rank items as equivalent, overlap them. ResetHelp Least reactiveMost reactive
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