When an aldehyde is heated with Fehling’s solution, a reddish-brown precipitate is formed due to which compound?(a) CuS(b) AgBr(c) Cu2O(d) CdSThe question was posed to me in a job interview.My question is taken from Aldehydes and Ketones Chemical Reactions in section Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

When an aldehyde is heated with Fehling’s solution, a reddish-brown

1.	When an aldehyde is heated with Fehling’s solution, a reddish-brown precipitate is formed due to which compound?(a) CuS(b) AgBr(c) Cu2O(d) CdSThe question was posed to me in a job interview.My question is taken from Aldehydes and Ketones Chemical Reactions in section Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12
Answer» Right choice is (c) Cu2O Explanation: Fehling’s reagent has Cu^2+ ions which OXIDISE aldehyde by ADDING an O ATOM and turning it into CORRESPONDING carboxylate ion. In this process, a reddish-brown compound is precipitated DUE to the formation of cuprous oxide.

Discussion

No Comment Found

Related InterviewSolutions

Benzoic acid undergoes Friedel-Crafts alkylation to form o- and p-Toluic acid.(a) True(b) FalseI got this question in homework.Asked question is from Carboxylic Acids Chemical Reactions topic in portion Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12
Acetic acid behaves exactly like ethanol on reaction with thionyl chloride.(a) True(b) FalseI have been asked this question during an online interview.The query is from Carboxylic Acids Chemical Reactions topic in portion Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12
The reaction of carboxylic acids with NaHCO3 produces ______ which helps it to differentiate it from phenols.(a) H2O(b) CO(c) CO2(d) NaClThis question was addressed to me in exam.Query is from Carboxylic Acids Chemical Reactions topic in section Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12
Which of the following is not a reason for carboxylic acids having higher boiling point than alcohols of comparable molecular masses?(a) Presence of electron withdrawing carbonyl group(b) Higher polarity of OH bond than in alcohols(c) Formation of two hydrogen bonds to form cyclic dimers(d) Presence of more alkyl groups in carboxylic acidsThe question was posed to me during an online interview.Enquiry is from Carboxylic Acids Physical Properties topic in section Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12
Which of the following acids have a double bond in their structure?(a) Isobutyric acid(b) Succinic acid(c) Acrylic acid(d) Glutaric acidI had been asked this question during an online exam.Query is from Nomenclature and Structure of Carboxyl Groups topic in chapter Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12
Identify the catalyst in the nucleophilic addition of HCN to acetone.(a) NaOH(b) HCl(c) NaCl(d) NaCNI got this question during an interview.My question is from Aldehydes and Ketones Chemical Reactions topic in division Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12
Aldehydes and ketones undergo __________ reactions.(a) electrophilic addition(b) electrophilic substitution(c) nucleophilic addition(d) nucleophilic substitutionI got this question in semester exam.My enquiry is from Aldehydes and Ketones Chemical Reactions in section Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12
Identify the reagent(s) for the conversion of chlorobenzene to 3-chlorobenzaldehyde.(a) CrO3 and (CH3CO)2O(b) CrO2Cl2; H2O(c) Cl2/hv; H2O(d) CO, HCl and CuClThe question was posed to me by my college director while I was bunking the class.This interesting question is from Preparation of Aldehydes and Ketones topic in section Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12
Benzaldehyde can be obtained from the hydrolysis of the product formed during side chain chlorination of toluene.(a) True(b) FalseI got this question in an interview for internship.Enquiry is from Preparation of Aldehydes and Ketones topic in chapter Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12
Vanillin is an aldehydic compound.(a) True(b) FalseThis question was addressed to me during an online exam.My enquiry is from Nomenclature and Structure of Carbonyl Groups in section Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment