(D) In chlorocyclohexane,the chlorine atom is attached to a carbon atom that is further bonded to two other carbon atoms within the cyclohexane ring.

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(D) In chlorocyclohexane,the chlorine atom is attached to a carbon atom that is further bonded to two other carbon atoms within the cyclohexane ring. Since the carbon atom bearing the halogen is bonded to two other carbon atoms,it is a $secondary$ $(2^{\circ})$ carbon. Therefore,chlorocyclohexane is classified as a $secondary$ alkyl halide.