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Hydrocarbons question

2005 · Q123
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Hydrocarbons question

2005 · Q123

NEETChemistryHydrocarbonsMCQ+4 / −1
Which one of the following alkenes will react faster with H2 under catalytic hydrogenation conditions ?
  1. A
    AIPMT 2005 Chemistry - Hydrocarbons Question 30 English Option 1
  2. B
    AIPMT 2005 Chemistry - Hydrocarbons Question 30 English Option 2
  3. C
    AIPMT 2005 Chemistry - Hydrocarbons Question 30 English Option 3
  4. D
    AIPMT 2005 Chemistry - Hydrocarbons Question 30 English Option 4
View written solutionFree

Correct answer: A

Greater the number of alkyl groups(R) attached to the double bonded carbon atoms more stable is the alkene. Further the relative rates of hydrogenation decrease with increase of steric hindrance.
Thus, the stability of alkene will be

AIPMT 2005 Chemistry - Hydrocarbons Question 30 English Explanation 1


Hence alkene which will react faster with H2 is that which is most unstable.
AIPMT 2005 Chemistry - Hydrocarbons Question 30 English Explanation 2

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