Question : The compound to which H2 does not add is
Option 1: Biphenyl ethylene
Option 2: Tetraphenyl ethylene
Option 3: Tetra-a-naphthlethylene
Option 4: Tetra-9-phenanthrylethylene
Correct Answer: Tetraphenyl ethylene
Solution : The correct option is Tetraphenyl ethylene.
Tetraphenyl ethylene is a molecule with a distinct chemical structure that can not readily conduct addition reactions with hydrogen gas (H2) like other unsaturated hydrocarbons. This is due to the absence of the normal double or triple bonds seen in many unsaturated hydrocarbons. Tetraphenyl ethylene does not include any double or triple bonds. Each carbon-carbon link in the molecule is a single bond (sigma bond), and it is made up of four phenyl groups bonded to a central carbon atom. H2 does not readily add to tetraphenyl ethylene because there are no multiple bonds to break, and it does not undergo hydrogenation processes in the same manner that alkenes or alkynes do.
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