explain wurtz reaction

Answer: (d) 2, 2, 3, 3 tetra chiorobutane, Samacheer Kalvi 11th Chemistry Hydrocarbons Short Answer Questions, Question 31. Draw and name the structural formula for C4H8’? 36. Answer: (d) HDPE : plastic pipes (b) C5H12, Question 4. (d) C2 H6 and Cl2 The typical reactions of alkenes involve the addition of an electrophile across the double bond proceeding through ionic mechanism. Answer: Give the IUPAC name of the following compounds. (a) Formaldehyde 2. These polymers are used in the manufacture of floor tiles, shoe-soles, synthetic fibres, raincoats, pipes etc. When mono substituted benzene undergoes an electrophilic substitution reaction, the rate of the reaction and the site of attack of the incoming electrophile depends on the functional group already attached to it. (c) Aldol condensation The rotation of C – C single bond leads to different isomenc structure called as ………… Answer: (iv) directs the incoming electrophile to meta position by increasing the charge density relative to ortho and para position. It came out on May 22nd, 2020, two weeks and four days after the previous episode. Therefore the electron density at ortho and para positions increases as compared to the metci position, thus phenolic group activities the benzene ring for electrophilic attack at ortho and para positions and hetice – OH group is an ortho-para direction or and an activator. (b) Phenol 1. Therefore, maximum electron density will be there in toluene, followed by benzene and it is least in pn-dinitrobenzene. alkaline KMNO4, Question 28. Performed as a batch synthesis, the lithium bromine exchange reaction requires thorough dry ice cooling and extended dosing times. (i). Answer: Question 22. Kolbe’s electrolytic method is suitable for the preparation of symmetrical alkanes, that is alkanes containing even number of carbon atoms. Answer: Answer: Frozen mixture of water and methane gas is chemically known as methane clathrate. On reductive ozonolysis, X and Y gave four compounds CH3COCH3. Answer: Justify that this reaction is a redox reaction. 3.  This process is of great industrial importance, the quantity of gasoline is improved by isomerising its components. (b) Acetone, Question 13. 1. ethane Required fields are marked *. 3. Answer: A combustion reaction is a chemical reaction between a substance and oxygen with evolution of heat and light. Hence in alkanes with same number of carbon atoms, straight chain isomers have higher boiling point as compared to branched chain isomers. Some groups decreases the reactivity of benzene ring and are known as de-activating groups. (a) the eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain. VII. Let us consider the directive influences of phenolic( -OH) group. write all possible isomers for an aromatic benzenoid compound having the molecular formula C8H10. Question 11. This reaction is known as the Wurtz reaction. Question 15. (c) Ethene A → B + H2O. The hydrogen peroxide formed in the reaction may oxidise the carbonyl compound to carboxylic acid. The group which increases the eleiron deity at oìo and para positions of the ring are known as ortho-para directors. The increasing order of reduction of alkyl halides with zinc and dilute HCl is, The correct IUPAC name of the following alkane is, The addition of HBr to 1-butene gives a mixture of products A, B and C, (i) A and B as major and C as minor products, (ii) B as major, A and C as minor products, (iii) B as minor, A and C as major products, (iv) A and B as minor and C as major products. (c) LiAlH4 What is Wurtz reaction? An organic compound (A) on ozonolysis gives only acetaldehyde. H2SO4 at 333 K to give B. Answer: Question 16. Among cis and trans isomers, cis isomer is less stable than trans isomer. (a) (i) and (ii) Determine whether each of the following alkenes can exist as cis-trans isomers? CH3 group is ortho – para director and ring activator. It is made up of polystyrene whereas others are made up of polypropylene. Presence of (4n + 2) it electrons in the ring where n is an integer (n = 0,1,2…. Which of them is/are controlled oxidation reactions? Write a note on Kolbe’s electrolytic method? 1. Hence 01-1 group is an orilio para director and activator. (b) Statement – I and II are correct but statement-II is not correct explanation of statement – I (c) Acetaldehyde 2. What happens when isobutylene is treated with acidified potassium permanganate? Chemistry Class 11 Important Questions are very helpful to score high marks in board exams. Ozone adds to carbon-carbon triple bond of alkynes to form ozonides. (c) Statement – I is correct but statement – II s wrong. Major product of the below mentioned reaction is ………. Chemical equations for combustion of propane: Statements-I : Unlike alkenes and alkynes benzene undergoes substitution reactions rather than addition reaction under normal conditions. (a) Statement – I and II are correct and statement – II is correct explanation of statement – I. CH3MgX + HOH → CH4 – Mg(OH)X. 1. (a) Benzene Answer: Answer: (d) Naphthalene (a) Both (A) and (R) are correct and (R) is the correct explanation of (A). (c) Diapers Question 14. Attack of the electrophile on benzene ring to form arenium ion. Answer: 6. Answer: Draw the structure and write down the IUPAC name for the isomerism exhibited by the molecular formulae: The most stable conformer of butane is ……….. Toluene > benzene > m – dinitrobenzene. Explain Markovnikoffs rule with suitable example. Answer: Benzene (A) is treated with sodium and liquid ammonia to give 1.4 – cyclohexadiene (C). (c) CH3 – CH = CH – CH3 + O3 : 2CH3COCH3, Question 3. Because of their lower density than water they tòrm two layers and occupies the top layer. Explain the carcinogenity and toxicity of aromatic hydrocarbons. Question 27. (iii) Presence of (4n+2) π−electrons in the ring where n is an integer (n = 0, 1, 2,………..) [Huckel rule]. Will the butene thus formed on reduction of 2-butyne show the geometrical isomerism? (a) – NO2, Question 21. Arrange benzene, n-hexane and ethyne in decreasing order of acidic behavior. How will you prepare propyne from gem dihalides? Question 4. In these resonance structures, the negative charge residue in the present at orilio and para positions of the ring structure. The actual structure of benzene is the hybrid of two hypothetical resonance structures. Answer: An alkyl halide and lithium dialkyl cupratc are reacted to give higher alkanes. This would form a hydrocarbon. What happens when propcne reacts with concentrated H,S04? (a) – CHO When an unsymmetrical alkene reacts with hydrogen halide, the hydrogen atom adds to the carbon atom that has more number of hydrogen atoms and halogen add to the carbon atom having fewer hydrogen atoms. Answer: (iv) increases the charge density at meta position relative to the ortho and para positions of the ring by resonance. 1. (a) Pent – 1 – ene, Question 30. Benzene (A) reacts with O2 is the presence of V2O5 at 773K to give maleic anhydride (B). (c) (A) is correct but (R) is wrong. Question 13. Answer: (a) PET : shampoo bottles Answer: Some meta-directing substituents in aromatic substitution are given. C5H10 – Pentene (3 isomers) Question 18. BHC (Ben.zene hexachioride), Question 41. Propyne (A) on passing through red hot iron tube at 873 K will give mesitylene (C). This reached is reversible nd desulphonation occus readily in aqueous medium. (b) – NO2 Due to more steric interaction cis isomers is less stable than Irons isomer. Answer: Question 5. During fractional distillation, coal tar is heated and distills away its volatile compounds, namely, benzene, toluene, xylene in the temperature range of 350 K to 443 K. These vapours are collected at the upper part of the fractionating column. (c) C7H8 3. Bromine water test: It is found in gasoline exhaust and barbecued food. Which one of the following is not a meta director’? Fine the odd one out: Answer: Answer: Question 5. Arrange the following alkyl halides in decreasing order of the rate of β– elimination reaction with alcoholic KOH. Addition of hydrohalides to alkene is an example for ………… Which of them is more stable? How will you distinguish 1 – butyene and 2 – butyne? Answer: Answer: If the similar groups lie on the opposite side then the geometrical isomers are called as trans-isomers. A few examples are: Question 16. Consider the nitration of benzene using mixed conc. Propyne on passing through red hot iron tube gives ……… R – MgX, Question 9. Discuss the Kekule’s structure of benzene. (i) From n-heptane, (d) 2, 3 – Dimethylbut – 2 – ene (a) CnHn Ethyne undergo hydration on warming with mercuric sulphate and dil H2SO4 at 333 K to form ethanol (Acetaldehyde). (b) Toluene 2. Despite their – I effect, halogens are o- and p-directing in haloarenes. Pyrolysis is defined as the thermal decomposition of an organic compound into smaller fragments in the absence of air through the application of heat. The molecules having dipole moment are __________. Phenyl magnesium bromde reagent reacts with water molecule to give benzene: Question 25. What are all the conditions for aromaticity? Wurtz reaction (for symmetrical alkanes) When only one alkyl halide is taken. 3. Complete the following reaction and identify A, B and C. Out of benzene, m – dinitrobenzene and toluene which will undergo nitration most easily and why? In these resonance structures, the positive charge residue is present on the ring structure. The H-I bond is further weaker (296.8 kJ mol-3) than H-Cl bond. (b) PS : disposable utensils All orders are custom made and most ship worldwide within 24 hours. Answer: (c) 1, 1, 2, 2 – tetrachlorobutane h3h3Productions is an Israeli-American comedic YouTube channel run by the married couple Ethan Edward Klein (born:June 24, 1985 (1985-06-24) [age 35]) and Hila Klein (née Hakmon; born:December 12, 1987 (1987-12-12) [age 33]), commonly consisting of comedic reaction videos with sketches. For example: Question 12. (ii) Hydrogenation: Alkenes react with hydrogen in presence of Ni or Pd catalyst to form saturated compounds. Preparation of m-dinitrobenzene from benzene: (d) slower, Question 19. Answer: Question 30. alkenes and alkynes. (b) Acetaldehyde 3. IV Choose the odd one out Question 4. Answer: Question 17. Generation of CH3CO electrophile: Step 2 : Assertion : tert-Butyl bromide undergoes Wurtz reaction to give 2, 2, 3, 3-tetramethylbutane. (c) configurational isomers. 2. (d) PVC : Grocery bags. Give IUPAC names for the fllowing compounds ………… Hence unlike alkenes and alkynes, benzene undergoes substitution reactions rather than addition reactions under normal conditions. Answer: C6H5, Question 26. Assertion (A) : The compound cyclooctane has the following structural formula : (i) Both A and R are correct and R is the correct explanation of A. (c) C4H10 Which are the correct IUPAC names of the following compound? 12.5 kJ /mol, Question 12. Little activity, Question 15. Answer: Complete delocalisation of it-electrons in the ring. (h) Statement – I and II are correct but statement – II is not correct explanation of statement -I (a) CH3(CH2)3Br (ii). Dienes are the name given to compounds with ………. Spectroscopic measurements: Answer: (d) All of these Arrange the following in decreasing order of their boiling points. Answer: (a) Catalytic hydrogenation of propene (c) Statement – I is correct but statement – II is wrong. Question 3. Ethane, Question 22. Solution: 37. Question 5. Draw Newman and Sawhorse projections for the eclipsed and staggered conformations of ethane. (a) Statement-I and II are correct and statement-II ls correct explanation of statemen-I. Propene reacts rjth cone. Which of the following compounds will exhibit cis-trans isomerism This is also called as gammaxane or Lindane. 1. However resonating structures shows that electron density is more at meto position as compared to ortho and para positions. It obey Huckel’s rule, with n = 1, hence benzene is aromatic in nature. Answer: A reacts with chlorine in the presence of UV-light to give C which is used as insecticide. Acetylene undergoes cyclic polymerisation on passing through red hot iron tube. The lateral overlap of theirp-orbitals produces 3 it bond. Answer: Answer: (i) Wurtz reaction: Alkanes are produced by heating an alkyl halide with sodium metal in dry ether solution. Huckel proposed that aromaticity is a function of electronic structure of an organic compound. Mention the uses of Acetylene. (b) CH3 – CH2 – CH2 – CH = CH – CH3 → Hex – 2 – ene Propane + butane, Question 2. Get your assignment help services from professionals. free radical. Assertion (A) : Nitration of benzene with nitric acid requires the use of concentrated sulphuric acid. Answer: (d) Chlorobenzene (ii) activates the ring by inductive effect. Answer: Question 10. (b) the staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain. alkanes with an odd number of carbon atoms), because if two dissimilar alkyl halides are used as reactants, a mixture of alkanes is obtained as the items. Conversion of ethyl chloride into ethane: 2. Answer: (a) Nitrobenzene Staggered conformation: Answer: Answer: In the following questions a statement of assertion (A) followed by a statement of reason (R) is given. The least stable conformer of ethane is form ………. (b) Wurtz reaction (a) 1 – chlorobutane Answer: FeSO4 and HNO3, if a large quantity of KHSO4 is added to the mixture, the rate of nitration will be ……… Answer: Let us consider the directive influence of aldehydic (-CHO) group. Cyclohexane, Question 40. Match the hydrocarbons in Column I with the boiling points given in Column II. Cheap essay writing sercice. (d) (ii) only Answer: The methane molecule which is produced by biological process under the deep -ocean (at 4°C and 50 atm) does not simply reach the surface instead each molecule is trapped inside the clusters of 6 to 18 water molecules forming methane clathratcs. aromatic, Question 37. Draw the conformations of ethane using Newman projection formula method? ∴ here four rings are there, four double bond equivalent arc used. 2. (iv) 4–(1-methylethyl)– 5 – (1-methylpropyl)-decane. When vicinal dihalides are warmed with granulated zinc in methanol they lose a molecule. Answer: Question 1. (b) Phenol (d) Isopropyl chloride How will you prepare acetylene from potassium maleate? Conversion of ethyl chloride into n-butane: Answer: When phenol reacts with Zn-dust under dry distillation conditions it gives ……….. (b) – NO2 each atom in the ring has unhybridized p-orbital, and. Chain initiation: Find the alkyl halide. On this basis Kekule proposed that benzene consists of ring of carbon atoms with alternate single and double bonds. Explain the polyrnerisation of acetylene molecules.
explain wurtz reaction 2021