Advertisements
Advertisements
प्रश्न
Diphenyls are potential threat to the environment. How are these produced from arylhalides?
Advertisements
उत्तर
Diphenyl such as p,p ‘-dichlorodiphenyl trichloroethane (DDT) are posing serious environment problems because of its chemical stability and its fat solubility. Its residue accumulates in environment and its long-term effects could be highly dangerous.
Diphenyl can be prepared from aryl halides by the following two methods:
(i) Fittig reaction
(ii) Ullmann biaryl synthesis
APPEARS IN
संबंधित प्रश्न
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 the formula of the following compound:
Potassiumhexacyanoferrate(III)
In which of the following conversions, phosphorus pentachloride is used as the reagent?
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 ____________.
Why iodoform has appreciable antiseptic property?
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 |
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.
Which of the following will have a mesoisomer also?
Sodium ethoxide react with ethyl iodide to yield.
The compound that will not give iodoform on treatment with alkali and iodine is ______.
Give the IUPAC names of the following componus:
\[\ce{CICH2C =CCH2Br}\]
Write two uses of polyhalogen compounds.
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.
Which of these compounds is synthesised by chloral?
Iodoform can be prepared from all except:
