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Amines

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Question
CBSEENCH12011163
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Among the following compounds, the one that is most reactive towards electrophilic nitration is

  • Benzoic acid

  • Nitrobenzene

  • toluene

  • benzene

Solution

C.

toluene

The presence of electron releasing group like -R, -OH etc., increases the electron density at o/p position and thus, makes the benzene ring more reactive (at(o/p position) towards electrophile. On the other hand, electron withdrawing group like-COOH,-NO2 etc. If present, reduces electron density and thus, reduces the activity benzene nucleus towards electrophile.Thus, the order of the given compounds towards electrophilic nitration is

Thus, toluene is most reactive towards electrophilic nitration.

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Question
CBSEENCH12011190
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An organic compound (C3H9N) (A), when treated with nitrous acid, gave an alcohol and N2 gas was evolved. (A) on warming with CHCl3 and Caustic potash  gave  (C) which on reduction gave  iso-propyl methylamine predict the structure  of (A)

  • CH3-CH2 -NH -CH3

  • CH3CH2CH2-NH2

Solution

A.

straight C subscript 3 straight H subscript 7 NH subscript 2 space plus HNO subscript 2 space rightwards arrow with NaNO subscript 2 space plus HCl on top space straight C subscript 3 straight H subscript 7 OH space plus straight N subscript 2 space plus straight H subscript 2 straight O space greater than presubscript straight H subscript 3 straight C end presubscript presuperscript straight H subscript 3 straight C end presuperscript CH minus NC space rightwards arrow with Reduction on top space space stack greater than presubscript straight H subscript 3 straight C end presubscript presuperscript straight H subscript 3 straight C end presuperscript CH minus NH minus CH subscript 3 with iso minus propylmethyl space amine below
'A' is Isopropyl methylamine

Question
CBSEENCH12011053
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Consider the nitration of benzene using mixed conc. H2SO4 and HNO3. If a large amount of KHSO4 is added to the mixture, the rate of nitration will be

  • slower

  • uncharge

  • doubled

  • faster

Solution

A.

slower

IN the nitration of benzene in the presence of conc. H2SO4 and HNO3, benzene is formed.
HNO3 +H2SO4  rightwards harpoon over leftwards harpoon space NO subscript 2 superscript plus space plus HSO subscript 4 superscript minus space plus straight H subscript 2 straight O
If a large amount of KHSO4 is added to this mixture more HSO4- ion furnishes and hence the concentration of electrophile decreases, rate of electrophilic aromatic reaction slows down.

Question
CBSEENCH12011185
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Consider the reaction,
RCHO +NH2NH2 →RCH =N-NH2
What sort of reaction is it?

  • Electrophilic addition elimination reaction

  • Free radical addition-elimination reaction

  • Electrophilic substitution elimination reaction

  • Nucleophilic addition-elimination reaction

Solution

D.

Nucleophilic addition-elimination reaction

RCHO space plus straight N with bold. bold. on top straight H subscript 2 space rightwards arrow RCH equals straight N minus NH subscript 2 space plus straight H subscript 2 straight O
In the above reaction  negative space straight N with bold. bold. on top straight H subscript 2acts as nucleophilic species which adds on carbon. Therefore this is the case of the nucleophilic addition reaction. Simultaneously, a mole of H2O also eliminated. Therefore, overall this reaction is a nucleophilic addition-elimination reaction.

Question
CBSEENCH12011349
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In a reaction of aniline, a coloured product C was obtained.


Solution

D.

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