Answer:The mechanism of the formation of 4-nitrophenyl phenyl ether include the electrophilic substitution in phenol and the nitration of chlorobenzene.
Explanation:
To prepare the 4-nitrophenyl phenyl ether appropriate equivalent of aqueos NaOH is added to absolute phenol, dissolved gives a Phenoxide ion aqueous and is then added.
After the addition of the appropriate mole of chlorobenzene, to the mixture of HNO3 and H2SO4 is heated under reflux with stirring and exclusion of moisture for 5 hours. The alcohol is distilled off from the reaction mixture to a substantial extent through a 20-cm Vigreux column with stirring and the cooled distillation residue is poured into 100 ml of 5% caustic sodium carbonate; the organic phase is extracted several times with diethyl ether, washed with water, and dried with calcium chloride; the solvent is distilled off, and the residue is fractionated or recrystallized from ethanol. Unchanged phenol can be recovered by acidifying the aqueous alkaline solution and extracting it with ether.
The yield of 4-nitrophenyl phenyl ether 80%, m.p. 40°C; b.p. 286-287 °C; in the presence of HNO3 and H2SO4
Answer:
IF the fruit juice contains a high level of vitamin C, THEN the preventative effectiveness against common cold increases.
Explanation:
The hypothesis is a testable explanation of a scientific investigation. It aims at predicting the outcome of the experiment. One feature of the hypothesis is that it must be testable. The hypothesis is usually written in an "IF, THEN" format.
This question is regarding an experiment to test the amount of vitamin C in fruit juice. The vitamin C is thought to be an effective preventative against common cold. Hence, the hypothesis connects the effect on common cold (dependent variable) with the amount of vitamin C (independent variable). The hypothesis can be written as:
IF the fruit juice contains a high level of vitamin C, THEN the preventative effectiveness against common cold increases.
Answer: The correct answer is
Earthquakes occur along fault lines, cracks in Earth's crust where tectonic plates meet. They occur where plates are subducting, spreading, slipping, or colliding. As the plates grind together, they get stuck and pressure builds up. Finally, the pressure between the plates is so great that they break loose.
Explanation: Mark me brain give 5 stars and a thank you
I think that the answer could be A. X and Y
The question is all about which among the given choices is true or properly describes the valence electron of the metallic bonds. These valence electrons of the metallic bond is shared amongst many atoms so that the metals can be bounded together. Hope this answers your qn. :)