Answer :
Answer:
1-chlorohexane is faster
Explanation:
In this case, all we need to do is to know the function of the reagent in the reaction, in other words, we need to know if the reagent promoves a Sn1 or Sn2 reaction.
If the reagent promoves a Sn1 reaction, the faster rate will be the reactant with the most stable carbon, which follows the order 3° > 2° >> 1°.
If the reagent promoves a Sn2 reaction, the faster rate will be the reactant with the less stable carbon, in the order 1° > 2° >> 3°.
This is because, the Sn2 reaction is a bimolecular reaction that it's really fast and use only 1 step. It actually doesn't leave carbocations intermediate, that's why it's neccesary that the reactant has the less stability and least steric hindrance.
Taking this into account, the NaI in acetone is a reagent that always promoves either a Sn2 reaction or E2. As it's promoving the Sn2 reaction, let's see which is more stable between chlorohexane and cyclohexylchloride.
The chlorine in the cyclohexyl, it's on a secondary carbon ( CH2 - CH - Cl), while the chlorine in the chlorohexane it's on a primary carbon (CH2 - Cl); also the chlorohexane do not have steric hindrance, while the cyclohexyl has a little because of the cyclo, making the Sn2 reaction slower.
Therefore, the Chlorohexane would have the faster rate