Number of hydrogen atoms required to saturate 5 molecules pentyne is _______.
A
10
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B
20
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C
5
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D
15
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Solution
The correct option is A20 One molecule of pentyne has 8 hydrogens i.e C5H8 according to the alkyne general formula CnH2n−2. The hydrogenation reaction of pentyne is as follow:
HC≡C−CH2−CH2−CH3+2H2Pt/Pd−−−−→CH3−CH2−CH2−CH2−CH3
Thus for one molecule of pentyne, we require 4 stoms of hydrogen. Thus for 5 molecules of pentyne we require 20 hydrogen atoms.