Name the major product formed when the vapours of following alcohols are passed over hot copper at 573K. Identify the product formed when ethanol is treated with Conc.H2SO4 at 413 K? Acidity decreases. The mechanism of acid dehydration of ethanol to yield ethene involves the following three steps: Step 1: Protonation of ethanol to form ethyl oxonium ion: Step 2: Formation of carbocation (rate determining step): Step 3: Elimination of a proton to form ethene: The acid consumed in step 1 is released in Step 3. H2SO4 at 443 K. askedDec 2, 2019in Chemistryby Annu03(52.9kpoints) kcet. When ehanol is heated with concentrated sulphuric acid at 443 K, dehydration takes place and ethene is formed. Boiling point of alcohols on increasing number of carbon atoms. Answer: What are phenols? Concentrated phosphoric (V) acid, H3PO4, can be used instead. How methanol is produced commercially? Write the chemical equation for the reaction. Complete the following equations. Phenols react with aqueous sodium hydroxide to form sodium phenoxide. Question 14. 1. Explain the preparation of phenols from cumene. Catalytic hydrogenation of aldehydes and ketones gives alcohol. Primary alcohol (1°) undergoes de-hydrogenation forming an aldehyde. Answer: Give the conversion of carbonyl compounds into alcohols. Question 28. Question 34. Ethanol can be dehydrated to give ethene by heating it with an excess of concentrated sulphuric acid at about 170°C. Answer: What is the effect of The dehydration of ethanol. Esterification reaction Phenols are more acidic than alcohols. In this reaction concentrated sulphuric acid acts as a dehydrating agent. How is diethyl ether prepared? Secondary alochol are oxdisied to ketone by CrO3. Give reason. 2C6H5OH + 2Na → 2C6H5ONa + H2 Question 4. Kindly Sign up for a personalized experience. H 3 PO 4 at 443K. As number of carbon atoms increases in linear alcohols, surface area increases, which increases the van der Waals forces and hence boiling point increases. Answer: Mechanism of dehydration of alcohol. (b) Diethyl ether. Question 33. Explain nitration of phenol. Answer: Due to this phenol easily donates hydrogen ion. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Ethanol is converted into ethoxy ethane, (1) by heating Ethanol with excess of conc. HCl is called Lucas reagent. 1answer. Explain Friedel-Crafts alkylation of anisole. Ethanol is converted into ethoxy ethane, (1) by heating Ethanol with excess of conc. Explain the oxidation of phenol with chromic acid. Identify A and B in the following reaction. Mechanism of Dehydration of Alcohols: Dehydration of alcohols follows E1 or E2 mechanism. Give the name of the reaction. three alkyl groups are attached to carbon atom bonded to -OH group. Answer: (Explain Friedel-C rafts acylation of anisole.) Explain the concept of tetravalency, catenation. Give its reaction with primary (1°) and tertiary (3°) alcohols? Alkenes react with water in the pre.ence of acid as catalyst. Acidity increases. Give its general equation. H 2 SO 4 or Conc. 0votes. Uses of Ethanol and Ethanoic a... Functional Groups and Homologous Series. Ethanol < Water < Phenol Answer: Write the mechanisms of the following reactions. How anisole reacts with acetyl chloride (CH3COCl) in the presence of anhydrous AlCl3? Tertiary alcohol (3°) undergoes dehydration forming an alkene. Answer: Answer: Question 45. to form alcohols. Ethanol (primary) alcohol undergoes dehydration in presence of Conc. What is the name of the reaction when ethanol is treated with Conc.H2SO4 at 413 K? Primary alcohols (1°) are those in which -OH is attached to primary carbon atom, i.e. (a) When phenol is treated with bromine in CS2 or CHCl3 at low temperature to form o-bromophenol and p-bromophenol. acid. The dehydration of alcohol follows the E1 or E2 mechanism. 2. Tertiary alcohols (3°) are those in which -OH group is attached to tertiary carbon atom, i.e. Name the reaction. Question 29. Answer: Question 32. 1. Answer: Want a call from us give your mobile number below, For any content/service related issues please contact on this number. Answer: Question 44. Question 13. Answer: Answer: Answer: Mechanism: Answer: Question 23. Answer: H2SO4 ,the initiation step is ………. It is converted into phenol by treating with dil. Answer: nitric acid phenol is converted to 2,4,6-trinitrophenol picric acid).