Diphenyls are potential threat to the environment. Chlorobenzene reacts with Mg in dry ether to give a compond (A) which further reacts with ethanol to yield, Benzene reacts with n-propyl chloride in the presence of anhydrous AlCl3 to give (a) 3-propyl-1-chlorobenzene, In the following reaction C5H5CH + Mg + Ether + H3O^+ → X, the product 'X' is, Among the following, the one which reacts most readily with ethanol is, An organic compound A (C4H9CI) on reaction with Na/diethyl ether gives a hydrocarbon, Purification and Characterisations of Organic Compounds. Assertion (A): Hydrolysis of (-)-2-bromooctane proceeds with inversion of configuration. Question 93. A secondary carbocation (carbonium ion) is formed because it is more stable than the primary one which would have been formed if the addition was the other way round. Question 45. Write a test to detect the presence of double bond in a molecule. (a) Dichloromethane (b) 1, 2-dichloroethane We all know that benzene undergoes aromatic electrophilic substitution reactions. Assertion (A): tert-Butyl bromide undergoes Wurtz reaction to give 2, 2, 3, 3-tetramethylbutane. Solution: (i —> b), (ii —> d), (iii —> e), (iv —> a), (v —> c) (ii) In this reaction, addition of HBr takes place on to the doubly bonded carbons of propene in accordance with Markownikoff’s rule and electrophilic addition takes place. Benzene and ethyl bromide in the presence of anhydrous aluminium chloride Ethyl benzene is given as the product. Missed the LibreFest? (d)Assertion is wrong but Reason is correct. Some alkylhalides undergo substitution whereas some undergo elimination reaction on treatment with bases. Benzene forms an alkyl banzene in friedel craft alkylation reaction.When benzene is treated with alkyl halide in the presence of alnhydrous aluminium chloride, alkyl benzene is given as the product. Hence, the reaction can be conducted at room temperature only, while primary and secondary alcohols require the presence of a catalyst ZnCl2. Question 68. (iii) p – p’ – Dichlorodiphenyl trichloroethane (DDT) The reactivity of aryl halides can be increased by the presence of an electron withdrawing group (-NO2) at ortho and para positions. Question 90. (d) Both the compounds are optically active Here, a transitory state is observed in which one bond is broken and one bond is formed synchronously he., in one step. In each case, you can only really be sure of that structure if you work through the mechanism first. (a)Assertion and Reason both are correct and Reason is the correct explanation of Assertion. Solution: Allyl chloride shows high reactivity because the carbocation formed by If a carbon atom satisfies all of its four valencies with four different groups then it is termed asymmetric/chiral carbon. (a) electrophilic elimination reaction Why is it necessary to avoid even traces of moisture during the use of a Grignard reagent? (a) (CH3)3C-F (b) (CH3)3C – Cl Which of the compounds will react faster in SN1 reaction with the –OH ion? (i) In haloarenes, the lone pair of electron on halogen are in resonance with benzene ring. Solution: C5H12, pentane has molecular mass 72 g mol-1 i.e., isomer of pentane which yields single monochloro derivative should have all the 12 hydrogens equivalents. Lewis acid generates the electrophile required for the substitution. Question 82. To put an ethyl group on the ring (to make ethylbenzene), benzene is treated with a mixture of ethene, HCl and aluminium chloride. (b) electrophilic substitution reaction A hydrocarbon of molecular mass 72 g mol-1 gives a single monochloro derivative and two dichloro derivatives on photo chlorination. (c) Halogen replaces alcoholic group Question 48. Cyanide ion acts as an ambident nucleophile. The chloride ion is immediately picked up by the aluminium chloride to form an AlCl4- ion. between haloalkane and water molecules and these are not very strong as the original hydrogen bonds present in water and hence the solubility of haloalkanes is low. NCERT NCERT Exemplar NCERT Fingertips Errorless Vol-1 Errorless Vol-2. (b) Addition of hydrogen halide on alkene (i) A mixture containing two enantiomers in equal proportions will have zero optical rotation, such a mixture is known as racemic mixture. Its residue accumulates in environment and its long-term effects could be highly dangerous. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. Question 59. Alkyl fluorides are synthesized by heating an alkyl chloride/bromide in Specify the reagents used in both cases. Therefore, the nitro group at meta position does not stabilize the negative charge but the carbanion is stabilized only by the p-electrons of the benzene ring. (a) SN1 reaction (b) SN2 reaction Solution: (b) Diethylbromomethane is. RMgX + H2O –>RH + Mg(OH)X. NCERT Exemplar Problems Maths Physics Chemistry Biology. This page gives you the facts and simple, ... benzene is treated with a mixture of ethene, HCl and aluminium chloride. Apne doubts clear karein ab Whatsapp (8 400 400 400) par (c) free radical addition reaction Question 97. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. (d) Molecularity of reaction is two. (a) (CH3),CHBr (b) (CH3)3C CH2Br So, it follows SN2 mechanism. Question 18. We hope the NCERT Exemplar lass 12 Chemistry Chapter 10 Haloalkanes and Haloarenes help you. (iii) Chloroquine, prevents the development of malaria parasite plasmodium vivax in the blood. CH3-CH2-CH=CH-CH3 + HCl–>A+B The catalyst is either aluminum chloride (or aluminum bromide if you are reacting benzene with bromine) or iron. The reaction is known as Swarts reaction. This rule states that “in dehydrohalogenation reactions, the preferred product is that alkene which has the greater number of alkyl groups attached to the doubly bonded carbon atoms”. Which of the following compounds can be classified as aryl halides ? But why does preparation of aryl iodides require presence of an oxidizing agent? The tert-butylbromide readily loses Br ion to form stable 3° carbocation. When Benzene diazonium chloride is treated with the presence of atmosphere for water then it give phenol product and N2 or hydrochloric acid (HCl… Question 80. No effect is observed by the presence of electron withdrawing group at weta-position Mechanism of the reaction is as depicted with OH ion: Solution: (d) Boiling point increases with increase in molecular mass of the alkyl with inverted configuration. Question 94. Solution: Question 21. The problem with more complicated alkenes like propene is that you have to be careful about the structure of the product. Give the structure of the hydrocarbon. NCERT RD Sharma Cengage KC … Know NCERT guidelines to safe & ethical use of online platforms by the students. Strictly speaking iron is not a catalyst, because it gets permanently changed during … Solution: (i) The molecular formulae of isomers of C4H9Br are CH3 CH3Cl + NH3 –> CH3NH2 + HCl (a) Both the compounds form same product on treatment with alcoholic KOH If ingestion continues for a long time, DDT builds up within the animal and affect the reproductive system.
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