1
MCQ (Single Correct Answer)

AIPMT 2008


A (predominantly) is
A
B
C
D

Explanation


We know that in case of an unsymmetrical alkene there is the possibility of forming two products. In such cases the formation of major product is decided on the basis of Markownikoffs rule which is rationalized in terms of stability of the carbocation. Also 3o carbocation is more stable than 2o carbocation and 2o carbocation is more stable than 1o carbocation.
2
MCQ (Single Correct Answer)

AIPMT 2007

Predict the product C obtained in the following reaction of 1-butyne.
A
B
C
D

Explanation

3
MCQ (Single Correct Answer)

AIPMT 2007

Which of the compound with molecular formula C5H10 yields acetone on ozonolysis?
A
3-Methyl- 1 -butene
B
Cyclopentane
C
2-Methyl-1-butene
D
2-Methyl-2-butene

Explanation



So, 2-methyl-2-butene yields acetone on ozonolysis.
4
MCQ (Single Correct Answer)

AIPMT 2005

Which one of the following alkenes will react faster with H2 under catalytic hydrogenation conditions ?
A
B
C
D

Explanation

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


Hence alkene which will react faster with H2 is that which is most unstable.

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