Among the following compounds, the one that is most reactive towards electrophilic nitration is
Benzoic acid
Nitrobenzene
toluene
toluene
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
Method by which aniline cannot be prepared is
hydrolysis phenyl isocyanide with the acidic solution
degradation of benzamide with bromine in alkaline solution
reduction of nitrobenzene with H2/Pd in ethanol
reduction of nitrobenzene with H2/Pd in ethanol
The following reaction,
is known by the name
Friedel -Crafts reaction
Perkins reaction
Acetylation reaction
Acetylation reaction
Which of the following statements about primary amines is false?
Alkyl amine are stronger bases than aryl amines
Alkyl amines reacts with nitrous acid to produce alcohols
Aryl amines react with nitrous acid to produce phenols
Alkyl amines are stronger base than ammonia
C.
Aryl amines react with nitrous acid to produce phenols
i) The presence of electron withdrawing substituent decrease the basicity while the presence of electron releasing substituent like, -CH3 - C2H5 etc increases the acidity.
ii) HNO2 converts - NH2 group of an aliphatic amine into - OH while that of aromatic amines into - N =NCl.
Since phneyl group is a electron withdrawing group, it decreases the basicity. Alkyl group, on the other hand, being electron releasing, increases the basicity. Thus, alkyl amines are more basic as compared to arylamines as well as ammonia.
Thus, HNO2 (nitrous acid ) converts alkyl amines to alcohols. But,
Thus, HNO2 does not convert aryl amines into phenol.