The general molecular formula, which represents the homologous series of alkanols is
A
CnH2nO
B
CnH2nO2
C
CnH2n + 2O
D
CnH2n + 1O
Explanation
All alcohols follow the general formula as
CnH2n+2O.
2
AIPMT 2005
MCQ (Single Correct Answer)
The best method for the separation of naphthalene and benzoic acid from their mixture is
A
distillation
B
sublimation
C
chromatography
D
crystallisation.
Explanation
Sublimation would be the best method because
it is applicable for those organic compounds which
pass directly from solid to vapour state on heating
and vice versa on cooling. In these compounds
naphthalene is volatile and benzoic acid is nonvolatile due to the formation of dimer via intermolecular hydrogen
bonding.
3
AIPMT 2005
MCQ (Single Correct Answer)
Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?
A
Ethyl chloride
B
Isopropyl chloride
C
Chlorobenzene
D
Benzyl chloride
Explanation
SN1 reaction is favoured by heavy groups
on the carbon atom attached to halogen i.e
Which amongst the following is the most stable carbocation?
A
$$\mathop C\limits^ + $$H3
B
CH3$$\mathop C\limits^ + $$H2
C
D
Explanation
3o C is more stable due to the stabilization of the
charge by three methyl groups (or inductive effect).
It can also be explained on the basis of
hyperconjugation.
Questions Asked from Some Basic Concepts of Organic Chemistry
On those following papers in MCQ (Single Correct Answer)
Number in Brackets after Paper Indicates No. of Questions
