Question

question 7 (1 point)
alkyl halides are hydrocarbons that contain at least one halogen atom.
what is the name of this alkyl?
a) 4,6 - dichloro - 1 - methylcylclohexane
b) 1,5 - dichloro - 2 - methylcyclohexane
c) 2,5 - dichloro - 1 - methylcyclohexane
d) 1,4 - dichloro - 5 - methylcyclohexane
e) 1,3 - dichloro - 4 - methylcyclohexane

Explanation:

To name an alkyl halide (cycloalkane derivative here), we follow IUPAC rules.

1. Identify the parent chain: The parent chain is cyclohexane.
2. Number the substituents: We number the ring to give the lowest - possible numbers to the substituents (chlorine atoms and methyl group).

• We start numbering from a carbon attached to a substituent.
• For the given structure, if we start numbering from the carbon with one of the chlorine atoms, we can assign the numbers such that the substituents get the lowest possible set of numbers.
• The two chlorine atoms and the methyl group are named in alphabetical order (chloro comes before methyl).
• The correct numbering gives the substituents at positions 1, 5 (for chlorine atoms) and 2 (for methyl group).

Answer:

B. 1,5 - dichloro - 2 - methylcyclohexane