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One mole of which of the following compounds requires 2 moles of hydrogen to form a saturated hydrocarbon by catalytic hydrogenation?
A. only P and Q
B. only R and S
C. only P and S
D. only P, Q and S
Answer:
To form a saturated Hydrocarbon, the product compound must have only single bonds between its carbon atoms.
A single double bond requires 1 Hydrogen molecule to convert it into a single bond.
A single triple bond would require 2 Hydrogen molecules to make a single bond.
Hence, any compound with 2 double bonds or 1 triple bond would satisfy the condition.
Therefore, the correct answer is C .
