21. Among formaldehyde, acetaldehyde and benzaldehyde, the aldehydes which undergo Cannizzaro's reaction are
22. 1-hexyne upon treatment with disiamylborane followed by the oxidation with H2O2 gives
23. The configurations at the three chiral centres in the bicyclodecanol given below, are
24. For the aldotetroses I-IV, the combination of true statements, among P-T, is
P = I and II are diastereomers and II and III are enantiomers
Q = I and IV are mesomers and are optically inactive
R = I and III can be interconverted by a base catalysed isomerisation
S = only I and IV are HlO4 cleavable
T = I and III are D-sugars and II and IV are L-sugars
P = I and II are diastereomers and II and III are enantiomers
Q = I and IV are mesomers and are optically inactive
R = I and III can be interconverted by a base catalysed isomerisation
S = only I and IV are HlO4 cleavable
T = I and III are D-sugars and II and IV are L-sugars
25. Which one of the following molecules will have n → \[\mathop \pi \limits^ * \] transition at the longest wavelength?
26. The correct order of-the basicity of the following compounds is
27. Reaction of phenyl acetate with anhydrous aluminium chloride generates a mixture of
28. The pKa values for the three ionisable groups X, Y and Z of glutamic acid are 4.3, 9.7 and 2.2 respectively
The isoelectric point for the amino acid is
The isoelectric point for the amino acid is
29. Among the isomers of C4H6 given below, the compound which exhibits an absorption band at 3300 cm-1 in the IR spectrum, is
30. Toluene when refluxed with Br2 in the presence of light mainly gives
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