Which compound has the highest Index of Hydrogen Deficiency (IHD)? Which of the
ID: 999591 • Letter: W
Question
Which compound has the highest Index of Hydrogen Deficiency (IHD)? Which of the following reactions could give racemization products? A meso molecule has positive optical rotation has two enantiomers is a chiral molecule has a plan of symmetry only has one chiral center Which of following molecule(s) is chiral? The ozonolysis of a symmetrical and branched alkene forms: A single aldehyde An aldehyde and a ketone Two different ketones Two different aldehydes A single ketone How many following compounds would yield methlycyclohexane after catalytic hydrogenations? one two three four fiveExplanation / Answer
Dear Student,
L. Index of Hydrogen is calculated as 2x + 2 - y
The option is A i.e C7H7 for which index of hydrogen deficiency is calculated as 2(7)+2-7 = 9
This has the highest index of hydrogen deficiency.
M. Sn1 reactions would give the racemization products.
Therefore, option B = Sn1.
N. A meso molecule has a plane of symmetry.
Explanation:
A meso compound should contain two or more identical substituted stereocenters. Also, it has an internal symmetry plane that divides the compound in half. These two halves reflect each other by the internal mirror. The stereochemistry of stereocenters should "cancel out". What it means here is that when we have an internal plane that splits the compound into two symmetrical sides, the stereochemistry of both left and right side should be opposite to each other, and therefore, result in optically inactive. Cyclic compounds may also be meso.
O. Which of the following molecule(s) are chiral ?
Here, the option is D.
The molecule does not have a plane of symmetry. Therefore, the molecule is most likely chiral.
P. The ozonolysis of symmetrical and branched alkene forms an aldehyde and a ketone.
Q. How many following compounds would yield methylcyclohexane after catalytic hydrogenation ?
The option is A. The fourth structure shown in the given question.
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