50. Beckmann?s rearrangent is a reaction of oximes in the presence of H
2SO
4 or PCl
5 to produce N-alkyl amide derivatives.
51. Migratory attitude of alkyl group in Pinacol-pinacolone, beckmann?s and bayer villegar oxidation is
- C
6H
5 > (CH
3)
3C - > (CH
3)
2CH - > C
2H
5 - > CH
3-
52. Cyclo hexanoneoxime on beckmann?s reaction gives caprolectum which on reaction with
to give polymer nylon-6
53. 2-methyl propanal even contains
-hydrogen atom but does not give aldol reaction.
54. Diphenyl glyoxal reacts with con. KOH to form salt of benzillic acid.
55. Propanone in the presence of dry HCl gas by enolic intermediate to form diacetone alcohol undergo heating form mesityl oxide. If this again reacts with propanone to form phoron.
56. Benzaldehyde reacts with alc. KCN to form Benzoin which on oxidation form benzil.
57. By wittig reaction carbonyl compounds are converted into E-Z form of alkene.
58. Benzaldehyde do not respond to benedict?s and fehling?s solution due to less redusing power of aromatic aldehyde.
59. HCOOH respond to oxidising agent due to presence of - CHO group.
60. HI > H
2SO
4 > HNO
3 > RCOOH > H
2CO
3 > C
6H
5OH > H
2O > CH
CH > NH
3 > CH
3 - C
CH > CH
2 = CH
2 > H
2 this is decreasing acidic nature.
61. Acids with
-hydrogen atom when reacts with halogen in the presence of P to form
-haloacid (HVZ).
62. Carboxyllic acid on reaction with PCl
5, CH
2N
2 and H
2O to form higher acid or next homologue.
63. For reactivity of acid derivatives use funda weaker the base better the leaving group.
64. Acid amide on reaction with PCl
5 to form alkane nitrile.
65. Anhydride on reaction with carbonyl compound in the presence of base (carbanian) forms
,
-unsaturated carboxyllic acid (perkin reaction)
66. Amide on reaction with Br
2 and alkali to form primary amine of lower homologue. Intermediate species is nitrene which undergo intra rearrangement to form RNH
2.
67. Ester?s with
-hydrogen atom in the presence of strong base to form carbanian undergo nucleophilic substitution reaction forms
-keto ester for example ethyl acetate in the presence of pot. ter. Butoxide form aceto acetic ester (AAE). reaction is known as clesen?s ester condensation of four types
(a) Simple clesen?s ester condensation.
(b) CROSS clesen?s ester condensation.
(c) Intra CEC (Dieckmann?s condensation).
(d) mixed clesen ester condensation.
68. For a compound to be aromatic it must be cyclic, planar and obey (4n + 2)
electron rule.
69. Cyclooctatetraene is non aromatic compound while pyrrole, pyredene, furan, cyclopentadieneylanion all are aromatic.
70. In aromatic electrophilic substitution reaction there is no hydrogen isotopic effect except sulphonation and iodination.
71. m- directing groups like nitrobenzene and benzaldehyde cannot undergo fridal craft reaction.
72. Phenol is less acidic than general carboxylic acid, cannot react with NaHCO
3.
73. Anilene is more reactive than phenol towards electrophilic substitution reaction because less energy difference between nitrogen and carbon.
74. Benzene diazonium chloride reacts with phenol or anilene to form azo compounds.
75. C
6H
5NH
2 > C
6H
5OH > C
6H
5OR > C
6H
5Br > C
6H
5NO
2 (Reactivity towards electrophilic substitution reaction.
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?C increases, the tetrahedrally bonded interme. diate becomes more crowded and these slower the rate.
is best able to donate electrons there by giving a very stable uncharged intermediate. In 
cross conjugation diminished its ability to donate electrons to an arenium ion.
Electrophilic Substitution Reaction
Nucleophilic Substitution Reaction
Nucleophilic Substitution Reaction
(Heat of Hydration)
) pair of enantiomers of 2,3-dibromobutane while in case of trans-2-butene forms meso-2,3-dibromo butane due to anti addition always.
and SO3-2.
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