Why aniline gives 2,4,6 tribromo aniline when reacts with bromine in aqueous medium? If we want to obtain monobromo derivative what should we do?

What happens when aniline reacts with bromine water at room temperature?

A Chloro derivative (A) on treatment with Zn/Cu couple gives a hydrocarbon with five C-atoms when 'A' is dissolved in ether and treated with Sodium, 2,2,5,5 tetramethyl hexane is obtained. What is the original compound 'A'?

An organic compound 'A' having molecular formula C_6H_6O gives a characteristic colour with aqeuous FeCI_3 solution. When 'A' is treated with CO_2 and NaOH at 400K under pressure 'B' is obtained. The compound B on acidification gives compound C which react with acetyl chloride to form D which is a popular pain killer. Deduce the structure of A, B, C and D.

In order to obtain p-nitro aniline from nitration of aniline, why -NH_2 group should be pro-tected?

In deriving Bernoulli’s equation, we equated the work done on the fluid in the tube to its change in the potential and kinetic energy, (a) What is the largest average velocity of blood flow in an artery of diameter 2 xx10^-3 m if the flow must remain laminar? (b) Do the dissipative forces become more important as the fluid velocity increases? Discuss qualitatively.

Give reasons for each of the following oberva-tions: Even under mild conditions aniline on bromi-natoin gives 2,4,6, tribromo aniline.