What will be the index of hydrogen deficiency in product of cholesterol undergoing catalytic hydrogenation with Pt?
A)1
B)2
C)4
D)5
E)none of these choices

Question

What will be the index of hydrogen deficiency in product of cholesterol undergoing catalytic hydrogenation with Pt? 
A)1 
B)2 
C)4 
D)5 
E)none of these choices

Quizplus · Accepted Answer

Cholesterol has 19 carbons and 4 rings, so it has four degrees of unsaturation (index of hydrogen deficiency) due to the four double bonds in the rings. Catalytic hydrogenation with Pt will convert those four double bonds to single bonds, eliminating all four degrees of unsaturation. Therefore, the index of hydrogen deficiency in the product will be 4-4=0, which corresponds to a fully saturated molecule.

What Will Be the Index of Hydrogen Deficiency in Product