Chemistry NCERT Exemplar Solutions Class 12th Chapter Ten

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The Correct Answer is Option (i). 

Enantiomers are stereoisomers of a substance that are not superimposable on each other. The carbon atom in the molecule (A) is asymmetric. The molecule's mirror image (i) and 180^? rotation cannot be superimposed on each other (A). The molecules (ii), (iii), and (iv) can all be superimposed on one other (A). The molecules (iii) and (iv) have 180^? rotations that are superimposable on one another (A). 

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The correct answer is (ii).The mirror copies of the molecules (a), (b), and (c) are non-superimposable. Because all four species linked to the carbon atom are identical, molecule (d) cannot have an asymmetric carbon atom, thus the mirror image of (d) when rotated 180? is superimposable on the original picture.

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The Correct Answer is Option (iii).

Isomeric alkyl halides' boiling points are related to their branching, with a reduction in B.P. as branching increases. As a result, the boiling point of the tertiary isomer is the lowest, while that of the primary isomer is the highest. Thus, the order of lowering boiling points is (b) > (a) > (c).

This is a multiple choice answer as classified in NCERT Exemplar

The Correct Answer is Option (i).

Alkyl halides have a higher density than water. Their densities are determined by the masses of the halogen atoms, the number of halogen atoms, and the number of carbon atoms. Simply expressed, Br has an atomic mass of 79 while Cl has an atomic mass of 35. (d) will be the heaviest of the molecules, followed by (c), (b), and (a). Because density is exactly proportional to mass, the order of decreasing densities will be the same. The right answer is (i).

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The correct Answer is Option (i). 

Chlorination in the presence of UV light can be used to produce alkyl chlorides from alkanes. Under the action of UV radiation, the chlorine molecule generates free radicals, which react with alkanes to create a mixture of isomeric mono- and poly haloalkanes. 

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Option (i)

The correct answer is option (i). Option (i) is an example of a Finklestein reaction, which is a halogen exchange reaction that produces alkyl iodide by treating alkyl halides with NaI in dry acetone. Option (ii) is an addition reaction in which an alkene is transformed to the equivalent alkyl halide. Option (iii) is a substitution reaction, whereas option (iv) is an electrophilic substitution reaction.

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The Correct Answer is Option (ii). Toluene is an aromatic hydrocarbon (C₆H₅-CH₃) that may be treated with halogens and utilised in an electrophilic substitution process to create aryl halides in the presence of the Lewis acid catalyst iron (III) chloride. In the absence of light, the reaction is carried out using chlorine or bromine, and the products are o- and p- haloarenes.

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The correct answer is (i). Sandmeyer's reaction can be used to synthesise haloarenes from amines. A primary aromatic amine that has been dissolved or suspended in cold aqueous mineral acid is treated with sodium nitrite to create a diazonium salt in this procedure. When this freshly produced salt is combined with cuprous chloride, the diazonium group is replaced with  - Cl, resulting in aryl chloride. Option I is the chemical Y, which is an aryl chloride.