In the following question two statements (Assertion) A and...

In the following question two statements (Assertion) A and Reason (R) are given. Mark. (a) if $\mathrm{A}$ and $\mathrm{R}$ both are correct and $\mathrm{R}$ is the correct explanation of $\mathrm{A}$ (b) if $\mathrm{A}$ and $\mathrm{R}$ both are correct but $\mathrm{R}$ is not the correct explanation of $A$ (c) $\mathrm{A}$ is true but $\mathrm{R}$ is false (d) A is false but $\mathrm{R}$ is true (A): The t-butoxide ion is a stronger base than $\mathrm{OH}^{-}$ or $\mathrm{C}_{2} \mathrm{H}_{2} \mathrm{O}^{-}$ but a much poorer nucleophile. (R): A negatively charged ion is always a more powerful nucleophile than its conjugate acid.

In the following question two statements (Assertion) A and Reason (R) are given. Mark.
(a) if $\mathrm{A}$ and $\mathrm{R}$ both are correct and $\mathrm{R}$ is the correct explanation of $\mathrm{A}$
(b) if $\mathrm{A}$ and $\mathrm{R}$ both are correct but $\mathrm{R}$ is not the correct explanation of $A$
(c) $\mathrm{A}$ is true but $\mathrm{R}$ is false
(d) A is false but $\mathrm{R}$ is true
(A): The t-butoxide ion is a stronger base than $\mathrm{OH}^{-}$ or $\mathrm{C}_{2} \mathrm{H}_{2} \mathrm{O}^{-}$ but a much poorer nucleophile.
(R): A negatively charged ion is always a more powerful nucleophile than its conjugate acid.

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Structure-Reactivity Relationships

Structure-reactivity relationships assess how the molecular structure, such as the presence of bulky groups or differences in electron density, influences both the thermodynamic stability (like basicity) and the kinetic behavior (like nucleophilicity) of chemical species.

Steric Hindrance

Steric hindrance involves the physical obstruction presented by bulky groups attached to a reactive center. In nucleophilic reactions, a bulky substituent can diminish reactivity by impeding the approach to the electrophile, even if the species is a strong base.

Basicity

Basicity is the thermodynamic tendency of a species to accept a proton and is typically measured by equilibrium constants. It does not always correlate directly with nucleophilicity, which is concerned with the rate at which a species participates in a bond-forming reaction.

Nucleophilicity

Nucleophilicity refers to the kinetic tendency of a species to donate an electron pair to an electrophile. It depends on various factors including charge, solvent, and the steric environment of the nucleophile.

Please give Ace some feedback