Arrange the following in decreasing order of | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The basicity of amines is inversely proportional to their $pK_{b}$ values. Stronger bases have lower $pK_{b}$ values,while weaker bases have highe

Vedclass · Accepted Answer

$d > c > b > a$

Vedclass · Answer

(C) The basicity of amines is inversely proportional to their $pK_{b}$ values. Stronger bases have lower $pK_{b}$ values,while weaker bases have higher $pK_{b}$ values.$1$. Comparing aliphatic amines: In aqueous solution,the basicity order of methyl-substituted amines is secondary $(CH_{3}NHCH_{3})$ > primary $(CH_{3}NH_{2})$ > tertiary $((CH_{3})_{3}N)$. Thus,$(CH_{3})_{3}N$ is a weaker base than $CH_{3}NH_{2}$,meaning $(CH_{3})_{3}N$ has a higher $pK_{b}$ value than $CH_{3}NH_{2}$.$2$. Comparing with benzylamines: Benzylamines ($C_{6}H_{5}CH_{2}NH_{2}$ and $C_{6}H_{5}CH_{2}NHCH_{3}$) are significantly less basic than aliphatic amines due to the electron-withdrawing $-I$ effect of the phenyl group.$3$. Comparing benzylamines: $C_{6}H_{5}CH_{2}NHCH_{3}$ (secondary) is more basic than $C_{6}H_{5}CH_{2}NH_{2}$ (primary) due to the $+I$ effect of the additional methyl group,despite the steric hindrance.Basicity order: $CH_{3}NH_{2} > (CH_{3})_{3}N > C_{6}H_{5}CH_{2}NHCH_{3} > C_{6}H_{5}CH_{2}NH_{2}$.Decreasing order of $pK_{b}$ values (inverse of basicity): $C_{6}H_{5}CH_{2}NH_{2} (d) > C_{6}H_{5}CH_{2}NHCH_{3} (c) > (CH_{3})_{3}N (b) > CH_{3}NH_{2} (a)$.Thus,the correct order is $d > c > b > a$.

Arrange the following in decreasing order of their $pK_{b}$ values:

Similar Questions

In the given reaction,$[X]$ will be:

When $R-CO-NH_2$ is treated with $Br_2$ and $KOH$,it gives $R-NH_2$ as the major product. Which intermediate is involved in this reaction?

The reaction of chloroform with alcoholic $KOH$ and $p-$toluidine forms:

What are $X$ and $Y$ in the following reactions?

Consider the following reaction sequence. The final product $D$ will be:
$C_6H_5CH_3$ $\xrightarrow[\Delta]{KMnO_4/H^+} A$ $\xrightarrow{SOCl_2} B$ $\xrightarrow[\Delta]{NH_3} C$ $\xrightarrow{KOH/Br_2} D$

Vedclass Test Series

Exam Paper Generator

Online Exam Module