A \( -\mathrm{CH}_{2}-\mathrm{CH}_{2}- \)
B \( -\mathrm{CH}_{2}-\mathrm{CHCL}_{} \)
C ( \( -\mathrm{CHCl}-\mathrm{CHCl}- \)
D \( -\mathrm{CHCl}-\mathrm{CCl}_{2-} \)
Correct Answer: Option B
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