The osmotic pressure of which solution is maximum? (consider that decimormal solution of each is 90% dissociated) :

• Aluminium sulphate

• Barium chloride

• Sodium sulphate

• A mixture of equal volumes of (b) and (c)

Phenol , in Liebermann's nitroso test , give the colour :

• red

• yellow

• blue

• pink

What will be the product ,when carboxy phenol ,obtained by Reimer Tiemann's process ,is deoxidised with Zn powder ?

What is the correct IUPAC name of :

• 4 - methoxy - 2 - nitrobenzaldehyde

• 4 - formyl - 3 - nitro anisole

• 4 - methoxy - 6 - nitrobenzaldehyde

• 2 - formyl - 5 - methoxy nitrobenzene

The safest and the most common alternative of sugar is :

• glucose

• aspartame

• saccharin

• cyclodextrin

The reaction ,

CH₃-CO-OCH₃ + C₂H₅OH $\stackrel{{\mathrm{H}}^{+} \mathrm{or} {\mathrm{OH}}^{-}}{\to }$ CH₃-CO-OC₂H₅ + CH₃OH is called :

• Perkin's reaction

• Claisen Schmidt reaction

• Esterification

• Trans-esterification

Which one of these elements is found in vitamin B₁₂ ?

• Fe

• Zn

• Mg

• Co

The monomer of teflon polymer is :

• CF₂=CF₂

• CF₂=CCl₂

• CH₂F-CH₂F

• CF₂=CFCl

The product obtained ,heating ethanol with conc. H₂SO₄ at 165° - 170°C is :

• (C₂H₅)₂SO₄

• CH₂=CH₂

• CH₂F-CH₂F

• CF₂=CFCl

50.

The structural formula of picric acid is :

• 

• 

• 

•