31.

Anhydrous ferric chloride is prepared by:

• dissoving Fe(OH)₃ in concentrated HCl

• dissolving Fe(OH)₃ in dilute HCl

• passing dry HCl overheated iron scrap

• passing dry Cl₂ gas overheated iron scrap

Two aromatic compounds having formula C₇H₈O which are easily identifiable by FeCl₃ solution test (violet colouration) are:

• o-cresol and benzyl alcohol

• m-cresol and p-cresol

• o-cresol and p-cresol

• methyl phenyl ether and benzyl alcohol

The ease of dehydrohalogenation of alkyl halide with alcoholic KOH is:

• 3° < 2° < 1°

• 3° > 2° > 1 °

• 3° < 2° > 1°

• 3° > 2° < 1 °

The correct order of decreasing acidity of nitrophenols will be:

• m-nitrophenol > p-nitrophenol > o-nitrophenol

• o-nitrophenol > m-nitrophenol > p-nitrophenol

• p-nitrophenol > m-nitrophenol > o-nitrophenol

• p-nitrophenol > o-nitrophenol > m-nitrophenol 

Which of the following compounds has maximum volatility?

Which one is not a constituent of nucleic acid?

• Uracil

• Guanidine

• Phosphoric acid

• Ribose sugar

In aqueous solution glucose remains as:

• only in the open-chain form

• only in the pyranose form

• only in furanose form

• in all three forms in equilibrium

The reaction of formaldehyde and ammonia gives:

• hexamethylene tetramine

• bakelite

• urea

• triethylene tetramine

Paracetamol is:

• methyl salicylate

• phenyl salicylate

• N-acetyl p-amino phenol

• acetyl salicylic acid

Which of the following compounds is not formed in iodoform reaction of acetone?

• CH₃COCH₂I

• ICH₂COCH₂I

• CH₃COCHI₂

• CH₃COCl₃