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Hydroxy ethanoic acid is a white solid, ...

Hydroxy ethanoic acid is a white solid, readly soluble in water. It is prepared by the hydrolysis of chloroethanoic acid with sodium hydroxide followed by acidification. It exhibits the properties of both a monocarboxylic acid and a primary alchol. In addition, it undergoes reactions which neither a carboxylic acid nor a primary alcohol can undergo.
Hydroxyl ethanoic acid can be prepared by

A

`HCHO underset((ii) H_3 O^+)overset((i)HCN)to HOCH_2 CO_2 H`

B

`CH_3 COOH underset((ii) KOH)overset((i) Cl_2 "red" P)to HOCH_2 CO_2 H`

C

`OHC-CO_2 H underset((ii) H_2 O)overset((i) LiAlH_4)to HOCH_2 CO_2 H `

D

`CH_3 - CO_2 H overset(Se)to HOCH_2CO_2 H`

Text Solution

Verified by Experts

The correct Answer is:
B
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Hydroxy ethanoic acid is a white solid, readly soluble in water. It is prepared by the hydrolysis of chloroethanoic acid with sodium hydroxide followed by acidification. It exhibits the properties of both a monocarboxylic acid and a primary alchol. In addition, it undergoes reactions which neither a carboxylic acid nor a primary alcohol can undergo. Which of the following ractions is NOT given by hydroxy ethanoic acid ?

Hydroxy ethanoic acid is a white solid, readly soluble in water. It is prepared by the hydrolysis of chloroethanoic acid with sodium hydroxide followed by acidification. It exhibits the properties of both a monocarboxylic acid and a primary alchol. In addition, it undergoes reactions which neither a carboxylic acid nor a primary alcohol can undergo. Which of the following reagent can convert 2-hydroxy propanoic acid to 2-oxo propanoic acid?

Hydroxy ethanoic acid is a white solid, readly soluble in water. It is prepared by the hydrolysis of chloroethanoic acid with sodium hydroxide followed by acidification. It exhibits the properties of both a monocarboxylic acid and a primary alchol. In addition, it undergoes reactions which neither a carboxylic acid nor a primary alcohol can undergo. Which of the following products is formed when hydroxyethanoic acid is being heated?

Which one of following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid ?

Alkanes can be prepared from sodium (or) potassium salts of carboxylic acid by using Kolbe's electrolysis or decarboxylation with the help of sodalime. (NaOH and CaO) Which of the Alkane cannot be prepared by Kolbe's electrolysis

An organic compound (A) with molecular formula C_(8)H_(8)O forms an orange-red precipitate with 2,4-DNP reagent and gives yellow precipitate on heating with iodine in the presence of sodium hydroxide. It neither reduces Tollens’ or Fehlings’ reagent, nor does it decolourise bromine water or Baeyer’s reagent. On drastic oxidation with chromic acid, it gives a carboxylic acid (B) having molecular formula C_(7)H_(6)O_(2) . Identify the compounds (A) and (B) and explain the reactions involved.

alpha - amino acids are high melting crystalline solids because of the zwitterion structure. They are moderately soluble in water. In acidic medium, alpha - amino acids exist as cations (I) and thus migrate towards cathode under the influence of an electric field. On the other hand, in alkaline medium, alpha - amino acids exist as anions (III) and thus migrate towards anode under the influence of an electric field. However, at some intermediate value of p^(H) , the concentration of the cationic form (I) and anionic form (III) will become equal and consequently the alpha - amino acid will exist primarily as the neutral dipolar ion (II). At this p^(H) , there would be no net migration of the amino acid in an electric field. This p^(H) at which there is no net migration of the amino acid under the influence of an applied electric field is called isoelectric point (pI). Each amino acid has a characteristic isoelectric point. The pH of an amino acid that does not have an ionisable side chain such as alanine isd average of pK_(a) values of the carboxyl group and the protonated amino group. H_(3)overset(+)(N)-overset("R")overset("|")("C")H-COOH overset(" "OH^(-)" ")underset(" "H^(+)" ")hArr H_(3)overset(+)(N)-underset("Zwitterion (II)")(overset("R")overset("|")("C")H)-COO^(-)overset(" "OH^(-)" ")underset(" "H^(+)" ")hArr underset((III))(overset(+)(N)-overset("R")overset("|")("C")H)-COO^(-) Further, the alpha - carbon of all the amino acids (except glycine) is chiral (asymmetric) and hence amino acids can exist in teo stereoisomeric forms i.e., D and L. However, all the nautrally occurring amino acids belong to the L - series. underset("L(-)Glyceraldehyde")(HO-overset("CHO ")overset("| ")underset(" "CH_(2)OH)underset("| ")("C ")-H)" " underset("L-Amino acid")(H_(2)N-overset("COOH")overset("| ")underset("R ")underset("| ")("C ")-H) In alanine, carboxyl group ionises at pK_(a1)=2.34 and ammonium ion at pK_(a2)=9.69 . The isoelectric point of the amino acid is at p^(H) .

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alpha - amino acids are high melting crystalline solids because of the zwitterion structure. They are moderately soluble in water. In acidic medium, alpha - amino acids exist as cations (I) and thus migrate towards cathode under the influence of an electric field. On the other hand, in alkaline medium, alpha - amino acids exist as anions (III) and thus migrate towards anode under the influence of an electric field. However, at some intermediate value of p^(H) , the concentration of the cationic form (I) and anionic form (III) will become equal and consequently the alpha - amino acid will exist primarily as the neutral dipolar ion (II). At this p^(H) , there would be no net migration of the amino acid in an electric field. This p^(H) at which there is no net migration of the amino acid under the influence of an applied electric field is called isoelectric point (pI). Each amino acid has a characteristic isoelectric point. The pH of an amino acid that does not have an ionisable side chain such as alanine isd average of pK_(a) values of the carboxyl group and the protonated amino group. H_(3)overset(+)(N)-overset("R")overset("|")("C")H-COOH overset(" "OH^(-)" ")underset(" "H^(+)" ")hArr H_(3)overset(+)(N)-underset("Zwitterion (II)")(overset("R")overset("|")("C")H)-COO^(-)overset(" "OH^(-)" ")underset(" "H^(+)" ")hArr underset((III))(overset(+)(N)-overset("R")overset("|")("C")H)-COO^(-) Further, the alpha - carbon of all the amino acids (except glycine) is chiral (asymmetric) and hence amino acids can exist in teo stereoisomeric forms i.e., D and L. However, all the nautrally occurring amino acids belong to the L - series. underset("L(-)Glyceraldehyde")(HO-overset("CHO ")overset("| ")underset(" "CH_(2)OH)underset("| ")("C ")-H)" " underset("L-Amino acid")(H_(2)N-overset("COOH")overset("| ")underset("R ")underset("| ")("C ")-H) N - terminus of the peptide structure is on the