Q18 of 30 Page 1

How will you convert:

(i) Propene to Propan-2-ol ?


(ii) Phenol to 2,4,6-trinitrophenol?


(i) Addition of water in acidic medium to propene yields propan-2-ol and not propan-1-ol. This is due to the formation of more stable intermediate 2° carbocation instead of the less stable 1° carbocation as the reaction proceeds in normal acidic condition. This is because it follows Markovnikoff’s Rule of addition.



(ii) Phenols give 2,4,6-trinitrophenol(Picric acid) when it reacts with a mixture of conc. HNO3 and H2SO4.



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(a) What type of semiconductor is obtained when silicon is doped with boron?

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Determine the osmotic pressure of a solution prepared by dissolving 2.5 × 10–2 g of K2SO4 in 2L of water at 25°C, assuming that it is completely dissociated.

(R =0.0821 L atm K–1mol–1, Molar mass of K2SO4= 174gmol-1)