The correct order of decreasing value of K_{e | vedclass

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

Question

(B) The addition of $HCN$ to carbonyl compounds is a nucleophilic addition reaction. The equilibrium constant $K_{eq.}$ depends on the electrophilicit

Vedclass · Accepted Answer

$d > a > b > c$

Vedclass · Answer

(B) The addition of $HCN$ to carbonyl compounds is a nucleophilic addition reaction. The equilibrium constant $K_{eq.}$ depends on the electrophilicity of the carbonyl carbon and the steric hindrance around it.$1$. Aldehydes are more reactive than ketones due to less steric hindrance and higher electrophilicity of the carbonyl carbon.$2$. Among aldehydes,$CH_3CHO$ $(d)$ is more reactive than $PhCHO$ $(a)$ because the phenyl group in $PhCHO$ provides resonance stabilization to the carbonyl group,reducing its electrophilicity.$3$. Among ketones,$CH_3CH_2COCH_3$ $(b)$ is more reactive than $PhCOCH_3$ $(c)$ because the phenyl group in $PhCOCH_3$ provides significant resonance stabilization and steric hindrance.Thus,the reactivity order (and hence $K_{eq.}$ order) is: $CH_3CHO > PhCHO > CH_3CH_2COCH_3 > PhCOCH_3$.Therefore,the order is $d > a > b > c$.

The correct order of decreasing value of $K_{eq.}$ for the addition of $HCN$ to the following carbonyl compounds is:
Reactant $K_{eq.}$
$PhCHO$ $a$
$CH_3CH_2COCH_3$ $b$
$PhCOCH_3$ $c$
$CH_3CHO$ $d$

Similar Questions

Which of the following compounds will respond to the haloform reaction with $I_{2}$ and $KOH$?

Reaction: $CH_3-CO-CH_2-CH_2-CH_2-CH_2-CHO \xrightarrow{HO^{-}/\Delta} \underset{(73\%)}{(A)}$
Product $(A)$ is

Benzaldehyde on reaction with acetophenone in the presence of sodium hydroxide solution gives

The major product formed in the following reaction is:

Product $(D)$ in the above sequence is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module

The correct order of decreasing value of $K_{eq.}$ for the addition of $HCN$ to the following carbonyl compounds is:Reactant$K_{eq.}$$PhCHO$$a$$CH_3CH_2COCH_3$$b$$PhCOCH_3$$c$$CH_3CHO$$d$