51. Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a compound if water during the reaction is continuously removed. The compound formed is generally known as
A
an amine
B
an imine
C
an enamine
D
a Schiff’s base
Answer :
an enamine
52.
Identify $$X$$ and $$Y$$ in the reaction.
\[C{{H}_{3}}\underset{\begin{smallmatrix}
|\,\,\,\,\, \\
C{{H}_{3}}\,
\end{smallmatrix}}{\mathop{-CH-}}\,CON{{H}_{2}}\xrightarrow{\frac{B{{r}_{2}}}{NaOH}}\] \[X\xrightarrow{HN{{O}_{2}}}Y\]
A
\[X=C{{H}_{3}}\underset{\begin{smallmatrix}
|\,\,\,\,\, \\
C{{H}_{3}}\,\,
\end{smallmatrix}}{\mathop{-CH-}}\,C{{H}_{2}}N{{H}_{2}};\] \[Y=C{{H}_{3}}\underset{\begin{smallmatrix}
|\,\,\,\,\, \\
C{{H}_{3}}\,\,
\end{smallmatrix}}{\mathop{-CH-}}\,C{{H}_{2}}-OH\]
B
$$X = C{H_3}CH = CHN{H_2};$$ $$Y = C{H_3}CH = CHOH$$
C
\[X=C{{H}_{3}}\underset{\begin{smallmatrix}
|\,\,\,\,\, \\
C{{H}_{3}}\,\,
\end{smallmatrix}}{\mathop{-CH-}}\,N{{H}_{2}};\] \[Y=C{{H}_{3}}\underset{\begin{smallmatrix}
|\,\,\,\,\, \\
C{{H}_{3}}\,\,
\end{smallmatrix}}{\mathop{-CH-}}\,OH\]
D
$$X = C{H_3}C{H_2}C{H_2}N{H_2};$$ $$Y = C{H_3}C{H_2}C{H_2}OH$$
Answer :
\[X=C{{H}_{3}}\underset{\begin{smallmatrix}
|\,\,\,\,\, \\
C{{H}_{3}}\,\,
\end{smallmatrix}}{\mathop{-CH-}}\,N{{H}_{2}};\] \[Y=C{{H}_{3}}\underset{\begin{smallmatrix}
|\,\,\,\,\, \\
C{{H}_{3}}\,\,
\end{smallmatrix}}{\mathop{-CH-}}\,OH\]
53.
The starting reagents needed to make the azo compound shown below
A
B
C
D
Answer :
54. Basic strength of different alkyl amines depends upon
A
$$ + I$$ effect
B
steric effect
C
solvation effect
D
all of these
Answer :
all of these
55. The best reagent for converting 2-phenylpropanamide into 2-phenylpropanamine is ________.
A
excess $${H_2}$$
B
$$B{r_2}$$ in aqueous $$NaOH$$
C
iodine in the presence of red phosphorus
D
$$LiAl{H_4}$$ in ether
Answer :
$$LiAl{H_4}$$ in ether
56. During preparation of arenediazonium salts, the excess of nitrous acid, if any, is destroyed by adding
A
$${\text{aq}}{\text{.}}\,NaOH$$
B
$${\text{aq}}{\text{.}}\,N{a_2}C{O_3}$$
C
$${\text{aq}}{\text{.}}\,N{H_2}CON{H_2}$$
D
$${\text{aq}}{\text{.}}\,KI$$
Answer :
$${\text{aq}}{\text{.}}\,N{H_2}CON{H_2}$$
57. The compound obtained by heating a mixture of primary amine and chloroform with ethanolic potassium hydroxide $$(KOH)$$ is
A
an alkyl isocyanide
B
an alkyl halide
C
an amide
D
an amide and nitro compound
Answer :
an alkyl isocyanide
58. A reagent suitable for the determination of $$N$$ - terminal residue of a peptide is
A
$$p$$ - toluene sulphonyl chloride
B
2, 4 - dinitrophenyl hydrazine
C
Carboxypeptidase
D
2, 4 - dinitrofluorobenzene
Answer :
2, 4 - dinitrofluorobenzene
59. In the nitration of benzene using a mixture of conc. $${H_2}S{O_4}$$ and conc. $$HN{O_3},$$ the species which initiates the reaction is ________.
A
$$N{O_2}$$
B
$$N{O^ + }$$
C
$$\mathop {N{O_2}}\limits^{ + \,\,\,\,\,\,} $$
D
$$NO_2^ - $$
Answer :
$$\mathop {N{O_2}}\limits^{ + \,\,\,\,\,\,} $$
60.
Mark the correct route of the conversion of $$p$$ - chloroaniline to $$p$$ - chlorobenzylamine.
(i)
(ii)
(iii)
(a)
Alkylation
$$KCN$$
$${H_2}/Pt$$
(b)
Diazotisation
$$CuCN$$
$${H_2}/Pt$$
(c)
Oxidation
$${H_2}/Pt$$
Hydrolysis
(d)
Diazotisation
$${H_2}O/{H^ + }$$
$$Sn/HCl$$
A
(a)
B
(b)
C
(c)
D
(d)
Answer :
(b)
