In the reaction sequence: CH_3-CHO xrightarro | vedclass

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

Question

(C) In the first step,the nucleophilic addition of $CN^{-}$ to the planar carbonyl group of acetaldehyde $(CH_3-CHO)$ occurs. Since the attack can hap

Vedclass · Accepted Answer

$A$ racemic mixture of $CH_3-CH(OH)-COOH$

Vedclass · Answer

(C) In the first step,the nucleophilic addition of $CN^{-}$ to the planar carbonyl group of acetaldehyde $(CH_3-CHO)$ occurs. Since the attack can happen from either side of the $sp^2$ hybridized carbon with equal probability,a racemic mixture of acetaldehyde cyanohydrin $(CH_3-CH(OH)-CN)$ is formed. In the second step,the acidic hydrolysis of the nitrile group $(-CN)$ converts it into a carboxylic acid group $(-COOH)$ without affecting the chiral center. Thus,the final product is a racemic mixture of lactic acid ($2$-hydroxypropanoic acid),which consists of both enantiomers: $CH_3-CH(OH)-COOH$ and $HOOC-CH(OH)-CH_3$. $CH_3-CHO + HCN$ $\xrightarrow{OH^{-}} CH_3-CH(OH)-CN 	ext{ (Racemic)}$ $\xrightarrow{H_2O/H^{+}, \Delta} CH_3-CH(OH)-COOH 	ext{ (Racemic)}$

In the reaction sequence: $CH_3-CHO$ $\xrightarrow{HCN, OH^{-}} (A)$ $\xrightarrow{H_2O/H^{+}, \Delta} \text{Product}$. The product will be:

Similar Questions

The major product formed in the following reaction is:

Which of the following reagents can form a hydrazone with alkanone?

Two moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous $NaOH$ after heating gives $x$ as the major product. The number of $\pi$ bonds in the product $x$ is.................

Assertion : The boiling points of aldehydes and ketones are higher than hydrocarbons and ethers of comparable molecular masses.
Reason : There is a weak molecular association in aldehydes and ketones arising out of the dipole-dipole interactions.

An organic compound having the molecular formula $C_8H_{10}O$ on being heated with $I_2$ and dilute $NaOH$ gives a yellow precipitate. The expected compound is

Vedclass Test Series

Exam Paper Generator

Online Exam Module