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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.
Give balanced equations for the following reactions:
Acetic anhydride with phosphorus pentachloride.
Give balanced equations for the following reaction:
Acetaldehyde with hydroxylamine.
Write balanced chemical equation for the following reaction:
Methyl magnesium iodide is treated with carbon dioxide and the product hydrolysed in acidic medium.
Write the formula of the following compound:
Triammine triaquachromium (III) chloride
Give a balanced chemical equation to convert methyl cyanide to ethyl alcohol.
In which of the following conversions, phosphorus pentachloride is used as the reagent?
Chloroform and conc. HNO3 reacts to produce ____________.
Chloropicrin is formed by the reaction of ____________.
Fitting reaction can be used to prepare ____________.
Chloromethane on treatment with excess of ammonia yields mainly ______.
Why iodoform has appreciable antiseptic property?
Name the alkene which will yield 1-chloro-1-methylcyclohexane by its reaction with \[\ce{HCl}\]. Write the reactions involved.
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?
How can you obtain iodoethane from ethanol when no other iodine-containing reagent except NaI is available in the laboratory?
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.
Convert the following:
Chloroethane to methanamine.
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?
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
Chloroform on reduction with Zn an HCI (all) gives:-
Westrosol is:-
In the above reaction if we take methylene chloride and isopropylidene chloride then products are ______.
The compound that will not give iodoform on treatment with alkali and iodine is ______.
Which among the following pairs has only herbicides?
The major product formed when 1, 1, 1-trichloropropane is treated with aqueous potassium hydroxide, is ______.
Write the equation for the following:
Oxidation of chloroform by air and light.
Write two uses of polyhalogen compounds.
Write equation to convert Methyl cyanide to ethanoic acid.
DDT is obtained by the reaction of chlorobenzene with ______.
Methyl bromide is not used ______.
Strong reducing agent converts CHCl3 into:
Assertion (A): Exposure of ultraviolet rays to human causes the skin cancer, disorder and disrupt the immune system. Sol. Reason (R): Carbon tetrachloride is released into air it rises to atmosphere and deplets the ozone layer. In the light of above statements, choose the most appropriate answer from the options given below.
Assertion (A): CHCI3 is stored in dark bottles. Reason (R): CHCl3 is oxidised in dark.
In the light of above statements, choose the most appropriate answer from the options given below
