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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 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
Write the formula of the following compound:
Potassiumhexacyanoferrate(III)
In the following sequence of the reactions, what is D?
The pesticide DDT slowly changes to __________.
Phosgene is a common name for ____________.
B.H.C. is used as an ____________.
Fitting reaction can be used to prepare ____________.
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?
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?
If chloroform is left open in air in the presence of sunlight, it gives
Ethyl chloride is converted into diethyl ether by
Ethyl bromide reacts with lead sodium alloy to from:-
Chlorination of CS2 give
Sodium ethoxide react with ethyl iodide to yield.
CH3NH2 react with CH3mg x to give
Westrosol is:-
Phenyl magnesium bromide reacts with methanol to give ______.
Which among the following pairs has only herbicides?
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 uses of carbon tetrachloride.
Give the uses of iodoform.
DDT is obtained by the reaction of chlorobenzene with ______.
Methyl bromide is not used ______.
Which of these compounds is synthesised by chloral?
Iodoform can be prepared from all except:
