- 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
Draw the possible isomers of:
\[ [ \text{Co}(\text{en})_2\text{Cl}_2 ]^+ \]- 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: - Which of the following is not a chiral molecule?
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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.
- Define the following:
(i) Enantiomers
(ii) Racemic mixture
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