81. The action of nitrous acid on an aliphatic primary amine gives
A
secondary amine
B
nitroalkane
C
alcohol
D
alkyl nitrite
Answer :
alcohol
82. Which of the following methods of preparation of amines will not give same number of carbon atoms in the chain of amines as in the reactant?
A
Reaction of nitrite with $$LiAl{H_4}.$$
B
Reaction of amide with $$LiAl{H_4}$$ followed by treatment with water.
C
Heating alkyl halide with potassium salt of phthalimide followed by hydrolysis.
D
Treatment of amide with bromine in aqueous solution of sodium hydroxide.
Answer :
Treatment of amide with bromine in aqueous solution of sodium hydroxide.
83. In order to prepare a $${1^ \circ }$$ amine from an alkyl halide with simultaneous addition of one $$C{H_2}$$ group in the carbon chain, the reagent used as source of nitrogen is ________.
A
sodium amide, $$NaN{H_2}$$
B
sodium azide, $$Na{N_3}$$
C
potassium cyanide, $$KCN$$
D
potassium phthalimide, $${C_6}{H_4}{\left( {CO} \right)_2}{N^ - }{K^ + }$$
Answer :
potassium cyanide, $$KCN$$
84. Nitrobenzene on reaction with $$conc.\,HN{O_3}/{H_2}S{O_4}$$ at $${80^ \circ }{\text{ - }}{100^ \circ }C$$ forms which one of the following products?
A
1, 2 - dinitrobenzene
B
1, 3 - dinitrobenzene
C
1, 4 - dinitrobenzene
D
1, 2, 4 - trinitrobenzene
Answer :
1, 3 - dinitrobenzene
85.
The following reaction,
is known by the name
A
Friedel-Crafts reaction
B
Perkins reaction
C
Acetylation reaction
D
Schotten-Baumann reaction
Answer :
Schotten-Baumann reaction
86. Consider the nitration of benzene using mixed $$conc.\,{H_2}S{O_4}$$ and $$HN{O_3}.$$ If a large amount of $$KHS{O_4}$$ is added to the mixture, the rate of nitration will be
A
slower
B
unchanged
C
doubled
D
faster
Answer :
slower
87. The compound that is most reactive towards electrophilic nitration is :
A
toluene
B
benzene
C
benzoic acid
D
nitrobenzene
Answer :
toluene
88.
In the given reaction
\[{{C}_{6}}{{H}_{5}}N{{H}_{2}}\xrightarrow{\frac{NaN{{O}_{2}}}{HCl}}X\xrightarrow{C{{u}_{2}}{{\left( CN \right)}_{2}}}\] \[Y\xrightarrow{\frac{{{H}_{2}}{{O}^{+}}}{{{H}^{+}}}}Z;\] $$Z$$ is
A
$${C_6}{H_5}NHC{H_3}$$
B
$${C_6}{H_5}COOH$$
C
$${C_6}{H_5}C{H_2}N{H_2}$$
D
$${C_6}{H_5}C{H_2}COOH$$
Answer :
$${C_6}{H_5}COOH$$
89.
\[C{{H}_{3}}C{{H}_{2}}Cl\xrightarrow{NaCN}X\xrightarrow{\frac{Ni}{{{H}_{2}}}}\] \[Y\xrightarrow[\text{anhydride}]{\text{Acetic}}Z\]
$$Z$$ in the above reaction is
A
$$C{H_3}C{H_2}C{H_2}NHCOC{H_3}$$
B
$$C{H_3}C{H_2}C{H_2}N{H_2}$$
C
$$C{H_3}C{H_2}C{H_2}CONHC{H_3}$$
D
$$C{H_3}C{H_2}C{H_2}CONHCOC{H_3}$$
Answer :
$$C{H_3}C{H_2}C{H_2}NHCOC{H_3}$$
90.
Aniline in a set of the following reactions yielded a coloured product $$Y.$$
\[\xrightarrow[\left( 273-278K \right)]{\frac{NaN{{O}_{2}}}{HCl}}X\xrightarrow{N,\,N\text{-dimethylaniline}}Y\]
The structure of $$Y$$ would be
A
B
C
D
Answer :
