Question

A compound x of molecular formula c8h12 with no triple bonds reacts with one equivalent of h2 to give a new compound having molecular formula c8h14. what can be inferred about the structure of compound x?

Answer 1

Compound X contains one double bond and reacts with hydrogen in a hydrogenation reaction to form an isomer with a single bond, changing its molecular formula from C8H12 to C8H14.

Step-by-step explanation:

The question relates to the structure of a compound with the molecular formula C8H12 that adds hydrogen to become C8H14. Since there are no triple bonds involved, and the compound reacts with one equivalent of H2 to give a new compound with two additional hydrogens, we can infer that compound X has one double bond. This addition of hydrogen is characteristic of a hydrogenation reaction, which reduces a double bond to a single bond by adding two hydrogen atoms.

In organic chemistry, similar compounds that differ only in the arrangement of their atoms and their chemical properties are known as isomers. Compound X and the resulting C8H14 compound are likely isomers, with the non-hydrogenated compound having a carbon-carbon double bond and the hydrogenated one having only single bonds.

Answer 2

The molecular formula given is C₈H₁₂, and it is also stated that it does not contain any triple bond and reacts with one equivalent H₂ to give a new compound with molecular formula C₈H₁₄.

First let us find the HDI (Hydrogen Deficiency Index) of this compound.

HDI = 2C + 2 + N - H - X / 2
So,
HDI = 2(8) + 2 - 12 / 2

HDI = 16 + 2 -12 / 2

HDI = 6 / 2

HDI = 3

Hence HDI 3 means, that our structure may contain following

1) 3 double bonds

2) 1 double bond and 1 triple bond

3) 3 Rings

4) 2 Rings and 1 double bond

5) 1 Ring and 2 double bonds

Hence, there are many possible isomers. But in statement it is given that it reacts with 1 equivalent H₂, means it contains only one double bond. So, according to my opinion our structure would contain 1 double bond and two rings as we are told in start that there is no triple bond. Hence, the possible structure is as follow along with reaction with 1 equivalent H₂.