Get the NCERT Solutions Class 12 Chemistry Chapter 10 Haloalkanes And Haloarenes here. Click to download NCERT class 12 chemistry solutions for. NCERT Solutions for Class science Chemistry Chapter 10 Haloalkanes And Haloarenes are provided here with simple step-by-step explanations. Chapter 10 – Haloalkanes and Haloarenes Download File: PDF icon NCERT Class 12 Chemistry Solutions Haloalkanes and Please wait.

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Butyliodoheptane iv 1,4-Dibromobutene v 1-Bromosec. Why claes sulphuric acid not used during the reaction of alcohols with KI? H 2 SO 4 is an oxidising agent.

It oxidises HI produced during the reaction to I 2 and thus prevents the reaction between an alcohol and HI to form alkyl iodide. Write structures of different dihalogen derivatives of propane. Four isomers are possible. Among the isomeric alkanes of mdlecular formula C 5 H 12identify the one that on photochemical chlorination yields i A single monochloride.

Pt increases with size of halogen atom. Pt increases as number of halogen atoms increase.

Which alkyl halide from the following pairs would you expect to react more rapidly by an S N 2 mechanism? In S N 2 mechanism, reactivity depends upon the steric hindrance around the C-atom carrying the halogen. Lesser the steric hindrance, faster the reaction. A hydrocarbon C 5 H 10 does not react with chlorine in dark but gives a single monochloro compound C 5 H 9 Cl in bright sunlight. The hydrocarbon with molecular formula C 5 H 10 can either a cycloalkane or an alkene.

Since the compound does not react with Cl 2 in the dark, haloarenees it cannot be an alkene but must be a cycloalkane. Since the cycloalkane reacts with Cl 2 in the presence of bright sunlight to give a single monochloro compound, C 5 H 9 Cl, therefore, all the ten hydrogen atoms of the cycloalkanes must be equivalent.

Thus, the cycloalkane is cyclopentane. The three dimensional structures of the three compounds along with the direction of dipole moment in each of their bonds are given below: CCl 4 being symmetrical has zero dipole moment. Since the dipole moment of latter resultant is expected to be smaller than the former, CHCl 3 has a finite dipole 1. Thus, CH 2 CI 2 has highest dipole moment. The hydrocarbon with molecular formula C 5 H, 0 can either a cycloalkane or an alkene.


Explain with an example.

NCERT Solutions class 12 Chemistry Haloalkanes and haloarenes part 1

Nucleophiles which can attack through two different sites are called ambident nucleophiles. For example, cyanide ion is a resonance hybrid of the following two structures: It can attack through carbon to form cyanide and through N to form is O cyanide. Thus, C atom of chlorobenzene has less tendency to release electrons to Cl than carbon atom of cyclohexylchloride. As a result, C — Cl bond in chlorobenzene is less polar than in cyclohexylchloride. Further, due to delocalization of lone pairs of electrons of the Cl atom over the benzene ring, C-Cl bond in chlorobenzene acquires some double bond character while the C — Cl in cyclohexy!

In other words, C-Cl bond in chlorobenzene is shorter than in cyclohexyl chloride. Since dipole moment is a product of charge and distance, therefore, chlorobenzene has lower dipole moment than cyclohexylchloride due claws lower magnitude of negative charge on the Cl atom and shorter C-Cl distance. The molecules of H 2 O are hold together by H-bonds.

Since the new forces of attraction between water and alkyl halide molecules are weaker than the forces of attraction already existing between alkyl halide — alkyl halide molecules and water-water molecules, thefefore, alkyl halides are immiscible not soluble in water. Alkyl halide are neither able to form H- bonds with water nor are able to break the H-bounding network of water. They clsas with moisture present in the apparatus to form alkanes Thus, Grignard reagents must be prepared under anhydrous conditions.

It was earlier used as an antiseptic but the antiseptic properties are due to the liberation of free iodine and not due to iodoform itsdf. Due to its objectionable smell, it haooarenes been replaced by other formulations containing iodine. Freon CCl 2 F 2 is solutinos common freons in industrial use. For aerosol propellants, refrigeration and air conditioning purposes. Many species of insects developed resistance nccert DDT, it was also discovered to have a high toxicity towards fishes.

DDT is not metabolised very rapidly by animals, instead it is deposited and stored in the fatty tissues. If the ingestion continues at a steady rate, DDT builds up within the animals overtime. KCN is a resonance hybrid of the following two contributing structures: Since C — C bond is stronger than C — N bond, therefore, attack occurs through C to form n-butyl cyanide.


The S N 2 reactions reactivity depends upon steric hindrance. More the steric hindrance slower the reaction. Thus, the reactivity of the given alkyl bromides decreases in the order: In Haloafenes N 1 reactions, the reactivity depends upon the stability of carbocations.

Haloalkanes and Haloarenes NCERT Solutions – Class 12 Chemistry

The p-isomer being more symmetrical fits closely in the crystal lattice and thus has stronger inter- molecular forces of attraction than o- and m-isomers. Since during melting or dissolution, the crystal lattice breaks, therefore, a large amount of energy is needed to melt or dissolve the p-isomer than the corresponding o-and m-isomers.

In other words, the melting point of the p-isomer is higher and haloardnes solubility lower than the corresponding o-and m-isomers. If aqueous solution, KOH is almost completely ionized to give OH — ions which being a strong nucleophile brings about a substitution reaction on alkyl halides to form alcohols. Further in the aqueous solution, OH — ions are highly solvated hydrated.

NCERT Solutions class 12 Chemistry Haloalkanes and haloarenes part 1

This solvation reduces the basic character of OH — ions which, therefore, fails to abstract a hydrogen from the P-carbon of the alkyl chloride to form alkenes.

In contrast, an alcoholic solution of KOH contains alkoxide RO — ion which being a much stronger base than OH — ions perferentially eliminates a molecule of HCl from an alkyl chloride to form alkenes. When a is reacted with sodium metal it give compound dC 8 H 18 which is different from the compound formed when n-butyl vlass is reacted with sodium.

Give the structural formula of a and write the equations haloarened all the reactions.

View PDF NCERT Class 12 Chemistry Solutions Haloalkanes and Haloarenes

Therefore, compound c is tert-butyl bromide which is an isomer of compound a ,i. Thus a is isobutyl bromide, b is 2-methyl-1 -propane, c is tert-butylbromide, and d is 2,5-dimethylhexane. Your email address will not be published. Notify me of new posts by email. Leave a Reply Cancel reply Your email address will not be published.

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