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
MCQ (Single Correct Answer)
AIPMT 2005
Products of the following reaction :
A
CH3COOH + CO2
B
CH3COOH + HOOC.CH2CH3
C
CH3CHO + CH3CH2CHO
D
CH3COOH + CH3COCH3
Explanation
3
MCQ (Single Correct Answer)
AIPMT 2004
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
MCQ (Single Correct Answer)
AIPMT 2004
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).
Questions Asked from Hydrocarbons
On those following papers in MCQ (Single Correct Answer) Number in Brackets after Paper Name Indicates No of Questions
