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प्रश्न
Write the environmental effects of DDT.
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उत्तर
- It is not completely biodegradable i.e. it is not very rapidly metabolized by animals. Instead, it gets deposited and store in fatty tissues. It is exists for longtime in soil, plants and animals as well. It produces unforeseen ecological effects.
- It is replaced by better and safer insecticide due to ecological problems.
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संबंधित प्रश्न
Draw structure of DDT.
Give the uses of freon 12.
How the following conversion can be carried out?
Isopropyl alcohol to iodoform
How the following conversion can be carried out?
Aniline to phenylisocyanide
How can the following conversions be brought about:
Methyl chloride to acetone.
Write the formula of the following compound:
Triammine triaquachromium (III) chloride
Write the formula of the following compound:
Potassiumhexacyanoferrate(III)
Give a balanced chemical equation to convert methyl cyanide to ethyl alcohol.
In the following sequence of the reactions, what is D?
Chloroform and conc. HNO3 reacts to produce ____________.
B.H.C. is used as an ____________.
Gammexane is ____________.
Chloropicrin is formed by the reaction of ____________.
Fitting reaction can be used to prepare ____________.
Major product obtained on reaction of 3-Phenyl propene with HBr in presence of organic peroxide.
Chloromethane on treatment with excess of ammonia yields mainly ______.
Name the alkene which will yield 1-chloro-1-methylcyclohexane by its reaction with \[\ce{HCl}\]. Write the reactions involved.
Diphenyls are potential threat to the environment. How are these produced from arylhalides?
What are the IUPAC names of the insecticide DDT and benzene hexachloride? Why is their use banned in India and other countries?
How will you obtain monobromobenzene from aniline?
Match the compounds given in Column I with the effects given in Column II.
| Column I | Column II | |
| (i) | Chloramphenicol | (a) Malaria |
| (ii) | Thyroxine | (b) Anaesthetic |
| (iii) | Chloroquine | (c) Typhoid fever |
| (iv) | Chloroform | (d) Goiter |
| (e) Blood substituent |
Assertion: It is difficult to replace chlorine by –OH in chlorobenzene in comparison to that in chloroethane.
Reason: Chlorine-carbon \[\ce{(C - Cl)}\] bond in chlorobenzene has a partial double bond character due to resonance.
Some halogen containing compounds are useful in daily life. Some compounds of this class are responsible for exposure of flora and fauna to more and more of UV light which causes destruction to a great extent. Name the class of these halocompounds. In your opinion, what should be done to minimise harmful effects of these compounds.
The most stable conformation of 1, 2-dibromomethane among the following is
 |
| I |
 |
| II |
 |
| III |
 |
| IV |
Which of the following does not give iodoform test?
The shape of methyl carbanion is similar to that of–
Which of the following will have a mesoisomer also?
If chloroform is left open in air in the presence of sunlight, it gives
Ethyl bromide reacts with lead sodium alloy to from:-
Chlorination of CS2 give
Sodium ethoxide react with ethyl iodide to yield.
In the above reaction if we take methylene chloride and isopropylidene chloride then products are ______.
Auto-oxidation of chloroform in air and sunlight produces a poisonous gas known as ______.
Write the equation for the following:
Oxidation of chloroform by air and light.
Give the IUPAC name of the following compound:
\[\ce{(CCl3)3CCl}\]
State the uses of iodoform (CHI3)
Write names of two polyhalogen compounds.
Write equation to convert Methyl cyanide to ethanoic acid.
Give the uses of DDT.
Give the uses of carbon tetrachloride.
Give the uses of iodoform.
DDT is obtained by the reaction of chlorobenzene with ______.
Methyl bromide is not used ______.
Strong reducing agent converts CHCl3 into:
Iodoform can be prepared from all except:
