Ncert Solutions Chemistry Class 12th

This is a matching answer type question as classified in NCERT Exemplar

The medicinal uses are linked to the halogen derivatives. Chloramphenicol is an antibiotic used to treat typhoid fever, thyroxine is a hormone whose dysregulation causes goitre, chloroquine is a malaria medication, and chloroform is often used as an anaesthetic.

Correct Answer: (i) →  (c) (ii) →  (d) (iii) →  (a) (iv) →  (b)

This is a multiple choice answer as classified in NCERT Exemplar

Heat an alkyl chloride/bromide in the presence of a metallic fluoride such as AgF, Hg₂F₂, CoF₂, or SbF₃ to produce alkyl fluorides. Swarts reaction is the name given to this reaction. CoF₂ and Hg₂F₂ are the only choices that work as reagents. NaF is not suitable because the end products of NaF  +  RCl→ RF  +  NaCl are soluble in the solvent, i.e. water, making separation difficult. As a result, the right alternatives are (ii) and (iii).

Correct Answer: Option (ii) and (iii)

This is a multiple choice answer as classified in NCERT Exemplar

Alcohols produce matching alkyl halides when they are treated with various reagents. Alcohols, red phosphorous, and bromine treated with alcohol produce alkyl chlorides and alkyl bromide, respectively, when treated with HCl+ZnCl₂. H₂SO₄ + KI cannot be used to convert an alcohol to alkyl iodide because they will convert KI to the equivalent acid, HI, which will then be oxidised to I₂. As a result, the right statements are (i) and (ii).

Correct Answer: Option (i) and (ii)

This is a multiple choice answer as classified in NCERT Exemplar

Aryl halides are halides in which the halogen atom is directly linked to the aromatic ring's sp² hybridised carbon atom. Only (i) and (iv) contain halogen atoms directly linked to aryl rings among the choices. As a result, they are known as aryl halides. (i) and (ii) are the right answers (iv).

Correct Answer: Option (i) and (iv)

This is a multiple choice answer as classified in NCERT Exemplar

Checking with the carbon atom it is connected to is one way to see if a compound has a secondary bromide. In a molecule, a secondary carbon group is linked to one hydrogen atom and three non-hydrogen groups. As a result of the foregoing possibilities, secondary bromides are formed when the -Br group is linked to the -CH group. (i) and (iii) are the right answers.

Correct Answer: Option (i) and (iii)

This is a multiple choice answer as classified in NCERT Exemplar

Dihaloalkanes with two halogen atoms linked to the same carbon atom are known as gem-dihalides. Alkylidene halides are another name for them. The chemical ethylene dichloride is a vicinal dihalide, meaning that chlorine atoms are linked to neighbouring carbon atoms. There is only one chlorine atom in benzoyl chloride. According to the molecule's nomenclature, ethylidene chloride is a gem-dihalide. The IUPAC terminology for methylene chloride is dichloromethane. Two chlorine atoms are joined to a single carbon atom in this compound.

Correct Answer: Option (i) and (iii)

This is a multiple choice answer as classified in NCERT Exemplar

Option (i) and (iv) have a halogen atom linked to an sp³ hybridised carbon that is single-bonded to other groups. The other possibilities are sp² hybridised because they are linked to carbon atoms, which are coupled to other groups in double bonds. Option I and (iv) are both correct.

Correct Answer: Option (i) and (iv)

This is a multiple choice answer as classified in NCERT Exemplar

The reaction is of the type S_N¹ nucleophilic substitution. This sort of reaction is governed by second order kinetics, in which the rate of reaction is determined only by the concentration of the reactant. A reaction's molecularity is defined as the number of molecules involved in the rate-determining phase. Because of second order kinetics, the moleculeity of this reaction is one. (i) and (iii) are the right answers .

Correct Answer: Option (A) and (C)