Delhi 2017) of cuprous oxide is obtained while propanone being a ketone does not respond to this test. All India 2017) Write chemical equations for the involved reactions. The carbonyl group of aldehyde and ketones is reduced to CH2 group on treatment with zinc amalgam and concentrated hydrochloric acid. (a) (i) Cross aldol condensation : When aldol condensation is carried out between two different aldehydes and/or ketones, it is called cross aldol condensation. mera hai mujhe jldi jldi...abhi sb message...or call pe call thoko....jldi....guys...mujhse baat krlo golden...chance hai... Delhi 2013) (Delhi 2011) (i) Cannizzaro reaction (ii) Decarboxylation (a) Give chemical tests to distinguish between Write the IUPAC name of the following: (Comptt. Question 81. (a) How will you bring about the following conversions: (i) Ethanol to 3-hydroxybutanal. (563-80-4), 2-Butyne-1,4-diol (i) Butan-l-ol to butanoic acid Chemical elements may or may not be included in the definition, depending on expert viewpoint. (a) Write the IUPAC names of the following compounds : Question 101. Answer: Acetophenone-yellow precipitates of iodoform are formed. Get chemical information updates for 3-Hydroxybutanal sent to your email. ‘C’ when heated with soda lime yields an aromatic hydrocarbon ‘D’. (a) (i) Ethanol and Propanal : (Comptt. (i) Benzaldehyde from Phenol (ii) Benzoic acid from Aniline (iii) Tollen’s Test: Benzaldehyde and acetophenone can be distinguished by the Tollen’s test. Answer: On heating with NaOH and I2, isomer B forms yellow precipitate of iodoform whereas isomer A does not form any precipitate. p-methylbenzaldehyde. (i) Ethylcyanide to ethanoic acid (ii) Butan-l-ol to butanoic acid Question 98. 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(c) Why pKa of F—CH2—COOH is lower than that of Cl—CH2—COOH? Compound ‘C’ is the sodium salt of the acid. (a) Account for the following : Derive the possible structure of compound A. (i) Chloroacetic acid is stronger than acetic acid. Ethanal gives yellow crystal of iodoform while propanal does not respond to iodoform test. (b) (i) Cyclohexanol to cyclohexan-1-one. (e) A and B are two functional isomers of compound C3H6O. Predict the productCH₂ CO CH₂ + HO - CH₂ Cry toHO-CH₂dil Hol​, Thank you so much aakriti sis bohot achi pic thi kartik aryan ki ​, the distance of the point p(1 -3) from the line 2y-3x=4 is, HAND WRITTEN NOT COPY PASTED ​, Name the reducing agent in the followingReaction3 Mn O2 + 4 AL -2 3 Mn + 2Al2O3 with reason​, 10. Answer: Answer: (a) Describe the following giving linked chemical equations : Formic acid is the only acid which contains aldehydic group and thus shows reactions with Tollen’s reagent (silver nitrate) and Fehling’s solution which Acetic acid does not show. Write chemical equations for all reactions taking place. (b) (i) Due to much stronger I-effect of F over Cl, the FCH2COO– ion is much more stable than ClCH2COO– ion and hence FCH2COOH is a stronger acid than ClCH2COOH. Question 59. (All India 2013) Delhi 2015) Erythro-selective chiral aldol condensations via boron enolates, EnamineBased Organocatalysis with Proline and Diamines: The Development of Direct Catalytic Asymmetric Aldol, Mannich, Michael, and DielsAlder Reactions, Amino Acid Catalyzed Direct Asymmetric Aldol Reactions: A Bioorganic Approach to Catalytic Asymmetric Carbon-Carbon Bond-Forming Reactions, De Novo Computational Design of Retro-Aldol Enzymes. (All India 2012) (All India 2012) Question 12. Therefore Butanal gives Tollen’s test. Question 15. It was formerly used in medicine as a hypnotic and sedative. (626-98-2, 13991-37-2, 27516-53-6), 2-Butene-1,4-diol Write the IUPAC name of Ph – CH = CH – CHO. (b) Write the structures of the main products of following reactions : (Delhi 2012) (ii) Decarboxylation reaction (Delhi 2017) CH3CHO, CH3COOH, CH3CH2OH (All India 2016) (9003-11-6, 107-21-1, 25322-68-3, 37225-26-6), METHACRYLIC ACID ∴ A = Formaldehyde, B = Methyl alcohol, C = Sodium formate, D = Formic acid. Question 14. Propanal: Propanal being an aldehyde forms silver mirror with Tollen’s reagent (Silver Mirror Test). Add your answer and earn points. (ii) The release of a proton from carboxylic acids is much easier than from phenols, IUPAC name : Pent-2-enal, Question 9. (Comptt. (ii) Propanal and Propanone : Propanal gives positive test with Fehling solution in which a red ppt. Acetophenone-yellow precipitates of iodoform are formed. Answer: (b) (i) On heating with NaOH and I2, ethanal forms yellow ppt of CHI3 whereas propanal can not. (b) (i) Because -COOH group is electron withdrawing group and deactivates the benzene ring. (ii) Decarboxylation using soda lime. Write one usefulness of this reagent. (a) (i) Benzaldehyde from Phenol. (ii) Ethyl benzene to Benzoic acid (a) (i) Wolff-Kishner reduction reaction : The reduction of aldehydes and ketones to the corresponding hydrocarbons by heating them with hydrazine and KOH or potassium tert-butoxide in a high boiling solvent like ethylene glycol is called Wolff-Kishner reduction. Illustrate the following reactions giving a suitable example for each. of a proton easier. Oxidation of (C) with chromic acid also produced (B). (Comptt. 1 See answer a0nine3etiameetalsmi is waiting for your help. Question 13. Answer: Question 51. (ii) Because of electron withdrawing nature of -NO2 group. (Delhi 2010) (ii) On treatment with dilute alkali, ethanal gives 3-hydroxybutanal which on heating produces but-2-enal. Question 106. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. (79-42-5), 110-64-5 Like 1,4-BD, it also behaves as a prodrug to GHB when taken exogenously. Write the equations for the reactions involved. (i) Cannizzaro’s reaction 3-Hydroxybutanal (acetaldol) is an aldol, formally the product of the dimerization of acetaldehyde. All India 2012) IUPAC name : 2-methylcyclohexanone. Give the structure and IUPAC name of the product formed when propanone is reacted with methylmagnesium bromide followed by hydrolysis. Derive the structure of the compound. Answer: Arrange the following compound groups in the increasing order of their property indicated: Propanol, Propane, Propanal (boiling point) (Delhi 2017) (a) Give reasons : Therefore, it undergoes Cannizaro’s reaction as follows : Question 107. (a) Write the chemical equation for the reaction involved in Cannizzaro reaction. Question 64. On dehydration (C) gives but-1-ene. (i) Propanal and propanone (ii) Benzaldehyde and Benzoic acid (Comptt. of iodoform but benzaldehyde does not. Answer: (a) (i) Acetylation: The addition of acyl (-COCH3) group on the ortho and para positions of acyl halide in the presence of a Lewis acid i.e. Give a chemical test to distinguish between benzoic acid and phenol.

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