Multiple Choice QuestionsWhich of the following will most stable diazonium salt RN2+X-?
CH3N2+X-
C6H5N2+X-
CH3CH2N2+X-
CH3CH2N2+X-
Nitrobenzene on reaction with conc. HNO3/H2SO4 at 80-1000C forms which one of the following products?
1,2-dinitrobenzene
1,3- dinitrobenzene
1,4-dinitrobenzene
1,4-dinitrobenzene
Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?
-C
N
-SO3H
-COOH
-COOH
Which of the following compounds will not undergo Friedel -Craft's reaction easily?
Cumene
Xylene
Nitrobenzene
Nitrobenzene
Among the following compounds, the one that is most reactive towards electrophilic nitration is
Benzoic acid
Nitrobenzene
toluene
toluene
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.
Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?
NaNH2
HCl
O2
O2
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
Electrophilic substitution elimination reaction
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
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