Class 12th

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

Due to the resonance stabilisation of the benzyl ring, compound (B) would conduct the S_N¹ reaction faster than compound (A). The carbocation C₆H₅CH₂Cl⁺  is very stable when the -Cl from the ring is cleaved, and it is driven to carry out the S_N¹ reaction.

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

Phenol will not react with HCl in the presence of ZnCl₂. This is owing to the presence of partial double bond properties between the benzene ring and O, which will result in resonance between the benzene ring and the OH -  group. As a result, no aryl halide will be made.

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

Nucleophilic substitutions occur when haloalkanes react with aqueous KOH. The tertiary halide 2-Bromo-2-methylpropane will react with aq. KOH the easiest of the compounds because the initial step involves cleavage of the alkyl and halide groups, resulting in the production of the extremely stable carbocation.

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

Methylenecyclohexane and 1-methylcyclohex-1-ene are two chemicals that can produce 1-chloro-1-methylcyclohexane.

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

The alkane C₅H₁₂ is a hydrocarbon with a molecular mass of 72gmol^?1. On photo-chlorination, the tert-isomer of pentane yields a single monochloro derivative and two dichloro derivatives. The following is the structure of the alkane and its chloride derivatives.

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

The IUPAC name for this compound is 1-Bromo-2,2-dimethylpropane

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

Because both methyl groups and chlorine atoms are symmetrically positioned at para-positions in compound (II), these molecules fit better in the crystal lattice than other isomers, and hence have the greatest melting point.

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

The addition reaction of the alkene produces two products, as indicated below.

CH₃−CH₂−CH=CH−CH₃ + HCl→ A + B

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

When an arene is treated with Cl₂ in the presence of FeCl₃, the electrophilic addition reaction chlorinates the arene to produce aryl chloride. As a result, the chemical provided is C₆H₅-CH₃, often known as toluene. o-chlorotoluene and p-chlorotoluene are the results of electrophilic substitution chlorination.