CBSE 12th Standard Chemistry Subject Haloalkanes and Haloarenes Ncert Exemplar 2 Mark Questions 2021
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CBSE 12th Standard Chemistry Subject Haloalkanes and Haloarenes Ncert Exemplar 2 Mark Questions 2021
12th Standard CBSE
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Reg.No. :
Chemistry
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What are the IUPAC names of the insecticide DDT and benzene hexachloride? Why is their use banned in india and other countries?
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Allyl chloride is hydrolysed more readily than n-propyl chloride. Why?
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Why it is necessary to avoid even traces of moisture during the use of a Grignard reagent?
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CBSE 12th Standard Chemistry Subject Haloalkanes and Haloarenes Ncert Exemplar 2 Mark Questions 2021 Answer Keys
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The IUPAC name of DDT is 2, 2-bis (4-chlorophenyl)-I, I, l-trichloroethane and that of benzene hexachloride is 1, 2, 3, 4, 5, 6-hexachlorocyclohexane. Their use in India and other countries has been banned because they are not biodegradable. As a result, these insecticides enter the food chain of animals and get deposited in their fatty tissues over a period of time and affect their reproductive systems.
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In S N1 reactions, carbocations are the intermediates. Obviously more stable the carbocation, more reactive is the alkyl halide. Since allyl chloride upon ionization gives allyl cation which is stabilized by resonance but the carbocation obtained from n-propyl chloride is not, therefore, allyl chloride It undergoes hydrolysis much faster than n-propyl chloride.
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Grignard reagents react with water to give the corresponding hydrocarbons.
\(\underset { Grignard\ reagent }{ RMgX } \ +\ HOH\longrightarrow \underset { Hydrocarbon }{ RH } \ +\ Mg(OH)X\)
