मराठी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

How will you convert ethanal into the following compound? But-2-enoic acid

Advertisements
Advertisements

प्रश्न

How will you convert ethanal into the following compound?

But-2-enoic acid

रासायनिक समीकरणे/रचना
Advertisements

उत्तर

\[\ce{\underset{Ethanal}{2CH3CHO}->[dil.NaOH][Aldol condensation ]\underset{but-2-enal}{CH3CH = CHCHO}->[Ag(NH3)^+2OH-][Tollens' reagent]\underset{But-2-enoic acid}{CH3CH = CHCO2H}}\]

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 8: Aldehydes, Ketones and Carboxylic Acids - Exercises [पृष्ठ २५६]

APPEARS IN

एनसीईआरटी Chemistry Part 1 and 2 [English] Class 12
पाठ 8 Aldehydes, Ketones and Carboxylic Acids
Exercises | Q 8.8 (iii) | पृष्ठ २५६

संबंधित प्रश्‍न

Distinguish between: CH3COOH and HCOOH


A and B are two functional isomers of compound C3H6O.On heating with NaOH and I2, isomer B forms yellow precipitate of iodoform whereas isomer A does not form any precipitate. Write the formulae of A and B.


Give a simple chemical test to distinguish between the following pair of compounds:

Benzaldehyde and Acetophenone


An organic compound contains 69.77% carbon, 11.63% hydrogen and rest oxygen. The molecular mass of the compound is 86. It does not reduce Tollens’ reagent but forms an addition compound with sodium hydrogensulphite and give positive iodoform test. On vigorous oxidation it gives ethanoic and propanoic acid. Write the possible structure of the compound.


Complete the synthesis by giving missing starting material, reagent or product.


\[C_6 H_5 - OH \to^{{Br}_2 \left( aq \right)} ?\]

Alkenes decolourise bromine water in presence of CCl4 due to formation of ______.


Which of the following compounds gives a positive Tollen's test but negative Fehling's test?


Solvent used for dewaxing of petroleum products are


Fehilng's test is positive for


A hydrocarbon (A) with molecular formula C5H10 on ozonolysis gives two products (B) and (C). Both (B) and (C) give a yellow precipitate when heated with iodine in presence of NaOH while only (B) give a silver mirror on reaction with Tollen’s reagent.

  1. Identify (A), (B) and (C).
  2. Write the reaction of B with Tollen’s reagent.
  3. Write the equation for iodoform test for C.
  4. Write down the equation for aldol condensation reaction of B and C.

An organic compound neither reacts with neutral ferric chloride solution nor with Fehling solution. It however, reacts with Grignard reagent and gives positive iodoform test. The compound is:


Choose the reaction which is not possible: 


The reagent that can be used to distinguish acetophenone and benzophenone is ______.


You are given four organic compounds “A”, “B” , “C” and “D”. The compounds “A”, “B” and “C” form an orange-red precipitate with 2, 4 DNP reagent. Compounds “A” and “B” reduce Tollen’s reagent while compounds “C” and “D” do not. Both “B” and “C” give a yellow precipitate when heated with iodine in the presence of NaOH. Compound “D” gives brisk effervescence with sodium bicarbonate solution. Identify “A”, “B”, “C” and “D” given the number of carbon atoms in three of these carbon compounds is three while one has two carbon atoms. Give an explanation for our answer.


Benzaldehyde is obtained from Rosenmund’s reduction of:


Match List-I with List-II:

  List-I
(Reaction)
  List-II
(Reagents/Condition)
A. I.
B. II. CrO3
C. III. KMnO4/KOH, Δ
D. IV. (i) O3 (ii) Zn-H2O

Choose the correct answer from the options given below:


Fehling’s solution ‘A’ is ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×