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1

AIPMT 2005

MCQ (Single Correct Answer)
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.
2

AIPMT 2005

MCQ (Single Correct Answer)
Products of the following reaction :
A
CH3COOH + CO2
B
CH3COOH + HOOC.CH2CH3
C
CH3CHO + CH3CH2CHO
D
CH3COOH + CH3COCH3

Explanation

3

AIPMT 2004

MCQ (Single Correct Answer)
Reaction of HBr with propene in the presence of peroxide gives
A
isopropyl bromide
B
3-bromopropane
C
allyl bromide
D
n-propyl bromide

Explanation

Reaction of HBr with propene in the presence of peroxide gives n-propyl bromide. This addition reaction is an example of anti-Markovnikov’s addition reaction.

4

AIPMT 2004

MCQ (Single Correct Answer)
Using anhydrous AlCl3 as catalyst, which one of the following reactions produces ethylbenzene (PhEt)?
A
H3C $$-$$ CH2OH + C6H6
B
CH3 $$-$$ CH $$=$$ CH2 + C6H6
C
H2C $$=$$ CH2 + C6H6
D
H3C $$-$$ CH3 + C6H6

Explanation

With ethene in presence of anhydrous AlCl3, benzene gives ethyl benzene (PhEt).

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