Answer
Please see the work below.
Work Step by Step
As the equal moles of the compounds are used so the highest $Cl^-$ concentration is for the compound having the larges subscript on Cl in the formula.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.