Answer:
Chlorine ion will attack the carbocation and double bond will not be created
Explanation:
The use of concentrated hydrochloric acid wiill be a poor choice as the acid catalyst for the formation of cyclohexane by dehydration of cyclohexanol because of the following reasons:
1) There will be presence of chlorine ions and they will attack the carbocation to form a single bond.
2) The formation of double bond will not occur in the process.
Therefore, it is a poor choice to use concentrated hydrochloric acid as the acid catalyst for the formation of cyclohexane by dehydration of cyclohexanol.