Dimeric Aluminium chloride and respective bond lengths are given below.

• A

  $\mathrm{X}=\mathrm{Y}$

• B

  $\mathrm{X}>\mathrm{Y}$

• C

  $\mathrm{X}<\mathrm{Y}$

• D

  $2\mathrm{X}=\mathrm{Y}$