What Are the Identities of Compounds Y and Z in This Boron Isolation Reaction?

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In the discussed boron isolation reaction, compound Y is identified as dichlorine (Cl2), a non-polar gas with terminal chlorine atoms. When heated with hydrogen gas (H2), it produces pure boron (B) and compound Z. Compound Z is likely hydrogen chloride (HCl), a gas that forms a highly acidic solution when dissolved in water. The balanced reaction is 2 Cl2 + 3 H2 --> 2 B + 6 HCl. This highlights the transformation of borax to pure boron through the identified compounds.
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Chemistry: "Road map" question.

Borax can be converted to pure boron through the series of chemical reactions shown below:
Pure boron is isolated in the final step of this reaction series. The starting material Y, is a non-polar gas with terminal chlorine atoms. Compound Y (2 mol) is heated under constant H2(g) pressure (3 mol) to yield the final products, B (boron) (2 mol) and compound Z (6 mol). Compound Z is a gas that when bubbled through water will produce a highly acidic solution.

Balance the equation for the reaction Y and fill in the blanks for the equation below.

2 Y + 3 H2 (g) --> heat --> 2 B + 6 Z

What are Y and Z.
 
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It is up to you to find out.

There are several hints in the question. What chlorine containing gases that give acidic solutions when dissolved do you know?
 
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