Advertisements
Advertisements
प्रश्न
Write the environmental effects of DDT.
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.
APPEARS IN
संबंधित प्रश्न
Give the uses of freon 12.
How the following conversion can be carried out?
Isopropyl alcohol to iodoform
How can the following conversions be brought about:
Methyl chloride to acetone.
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)
The pesticide DDT slowly changes to __________.
Phosgene is a common name for ____________.
B.H.C. is used as an ____________.
Among the following, insecticide is:
Fitting reaction can be used to prepare ____________.
\[\ce{CH3CH2CH2Br + NaCN -> CH3CH2CH2CN + NaBr}\], will be fastest in:
Diphenyls are potential threat to the environment. How are these produced from arylhalides?
How can you obtain iodoethane from ethanol when no other iodine-containing reagent except NaI is available in the laboratory?
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?
If chloroform is left open in air in the presence of sunlight, it gives
CH3NH2 react with CH3mg x to give
Westrosol is:-
The compound that will not give iodoform on treatment with alkali and iodine is ______.
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.
Write names of two polyhalogen compounds.
Write two uses of polyhalogen compounds.
Give the uses of DDT.
Give the uses of iodoform.