Upon catalytic hydrogenation,a compound C₆H₆ absorbs four moles of hydrogen.Select a structure for C₆H₆.

Question

Quizplus · Accepted Answer

When a compound absorbs four moles of hydrogen, it suggests the presence of four double bonds or four triple bonds which are converted into single bonds by hydrogenation. The compound C₆H₆ can be represented as: Structure I: H2C=CH-CH=S-CH=CH-CH=S-CH=CH2 Structure II: H2C=CH-S-CH=CH-S-CH=CH-S-CH=CH2 Structure III: H2C=C=S-CH2-CH=S-CH2-CH=S-CH=CH2 Structure IV: H2C=CH-S-CH=CH-CH=S-CH=CH2 Structure V: H2C=C=S-CH=CH-S-CH=CH-S-CH=CH2 From the above structures, only Structures IV and V have four double bonds, and hence these two are likely candidates for the given compound. Both of these structures have two -CH=CH- groups in conjugation with a -CH=S- group, and therefore they are isomers of each other. The structure of the compound cannot be determined definitively without additional information, but structures IV and V are the best choice(s) based on the given information.

Upon Catalytic Hydrogenation,a Compound C6H6 Absorbs Four Moles of Hydrogen

Upon Catalytic Hydrogenation,a Compound C₆H₆ Absorbs Four Moles of Hydrogen