- Piperidine>Pyridine>Pyrrole
- Pyrrole>Pyridine>Piperidine
- Pyridine>Piperidine>Pyrrole
- Pyrrole>Piperidine >Pyridine
The Correct Option is A
Solution and Explanation
Explanation: The basicity of a compound depends on the availability of the lone pair of electrons on nitrogen for protonation. The order of basic strength is:
N(sp3, localized lone pair) > N(sp2, localized lone pair) > N(sp2, delocalized lone pair, aromatic).
- Piperidine: Contains an sp3-hybridized nitrogen atom with a localized lone pair, making it the strongest base.
- Pyridine: Contains an sp2-hybridized nitrogen atom with a localized lone pair, making it moderately basic.
- Pyrrole: Contains an sp2-hybridized nitrogen atom with a delocalized lone pair due to its involvement in the aromatic ring, making it the least basic.
Thus, the order of basic strength is:
Piperidine > Pyridine > Pyrrole.
Thus the correct answer is Option 1.
Top Questions on Isomerism
The incorrect statements regarding geometrical isomerism are:
(A) Propene shows geometrical isomerism.
(B) Trans isomer has identical atoms/groups on the opposite sides of the double bond.
(C) Cis-but-2-ene has higher dipole moment than trans-but-2-ene.
(D) 2-methylbut-2-ene shows two geometrical isomers.
(E) Trans-isomer has lower melting point than cis isomer.
- Given below are two statements: Statement (I): \
Statement (II):
In the light of the above statements, choose the correct answer from the options given below: - Define the following:
(i) Enantiomers
(ii) Racemic mixture Given below are two statements:
Statement (I):
are isomeric compounds.
Statement (II):
are functional group isomers.
In the light of the above statements, choose the correct answer from the options given below:- The number of isomers possible for a dibromo derivative (Molecular weight = 186 u) of an alkene is (Br = 80 u):
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