Class 12th
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New answer posted
9 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
Oxidising chemicals such as HIO3 oxidise HI to I2 because the presence of HI causes the aryl iodides to revert to arenes in their absence.
Correct Answer: Option (iii)
New answer posted
9 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
Because halogen atoms are ortho and para directing, rather than ring deactivators, further electrophilic substitution occurs at ortho and para locations.
Correct Answer: Option (v)
New answer posted
9 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
The nitro group on the ortho and para positions of haloarenes acts as an electron-withdrawing group, making it more reactive to nucleophilic substitution reactions due to the electron deficit.
Correct Answer: Option (i)
New answer posted
9 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
Because tertiary butyl bromide interacts with NaI in dry ether to create 2, 3, 3-tetramethylbutane, it undergoes the Wurtz reaction to yield 2, 3, 3-tetramethylbutane.
Correct Answer: Option (i)
New answer posted
9 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
Haloalkanes react with AgCN to produce alkyl isocyanides as the primary product, whereas KCN produces alkyl cyanides.
Correct Answer: Option (iv)
New answer posted
9 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
Because of the size of the halogen atom, the boiling temperatures of alkyl halides drop in the specified sequence. With the greatest atomic number, iodide has the most electrons, resulting in increased Van Der Waals forces and a higher boiling point.
Correct Answer: Option (v)
New answer posted
9 months agoContributor-Level 10
This is a assertion and reason answer type question as classified in NCERT Exemplar
Thionyl chloride is favoured over phosphorus chlorides because the by-products produced, in addition to the alkyl halides, include SO2 and HCl, which are gaseous and so may escape the reaction, leaving just pure halides.
Correct Answer: Option (ii)
New answer posted
9 months ago
Contributor-Level 10
This is a matching answer type question as classified in NCERT Exemplar
In the presence of Na metal in dry ether, an alkyl halide and an aryl halide combine to create alkyl arene in the Wurtz-Fittig reaction.
The Fittig reaction, which involves a coupling reaction between two aryl halides in dry ether in the presence of Na metal, yielding diaryl compounds, is the second reaction.
The Sandmeyer reaction produces aryl halides from primary amines by converting them to diazonium salts and treating them with cuprous bromide.
The Finkelstein reaction, which produces alkyl iodides by reacting alkyl chlorides or bromides with NaI in dry acetone, i
New answer posted
9 months ago
Contributor-Level 10
This is a matching answer type question as classified in NCERT Exemplar
(i) A: 4-bromopent-2-ene.
(ii) B: 4-bromo-3-methylpent-2-ene.
(iii) C: 1-bromo-2-methylbut-2-ene.
(iv) D: 1 -bromo-2-methylpent-2-ene.
Correct Answer: (i) → (a) (ii) → (c) (iii) → (b) (iv) → (d)
New answer posted
9 months ago
Contributor-Level 10
This is a matching answer type question as classified in NCERT Exemplar
The first reaction is an electrophilic substitution process in which Cl+ from the Cl2 and FeCl3 combination attacks and substitutes the benzene ring.
Following Markownikoff's rule, the second reaction is an electrophilic addition reaction in which HBr is added across the double bond.
The third reaction is a nucleophilic substitution process that uses the SN1 mechanism to replace the -I group with -OH.
The nucleophilic aromatic substitution process, in which the -Cl group is replaced by -OH, is the fourth reaction.The fifth reaction is a dehydrohalogenation reacti
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