31.
In the following reaction, $$X$$ is
\[X\xrightarrow{\text{Bromination}}Y\xrightarrow{NaN{{O}_{2}}/HCl}Z\xrightarrow[{{C}_{2}}{{H}_{5}}OH]{\text{Boiling}}\text{Tribromobenzene}\]
A
benzoic acid
B
salicylic acid
C
phenol
D
aniline
Answer :
aniline
32. Benzamide on reaction with $$POC{l_3}$$ gives
A
aniline
B
chlorobenzene
C
benzylamine
D
benzonitrile
Answer :
benzonitrile
33. Complete reduction of benzene-diazonium chloride with $$Zn/HCl$$ gives :
A
Aniline
B
Phenylhydrazine
C
Azobenzene
D
Hydrazobenzene
Answer :
Aniline
34. Amongst the given set of reactants, the most appropriate for preparing $${2^ \circ }$$ amine is ________.
A
$${2^ \circ }R - Br + N{H_3}$$
B
$${2^ \circ }R - Br + NaCN$$ followed by $${H_2}/Pt$$
C
$${1^ \circ }R - N{H_2} + RCHO$$ followed by $${H_2}/Pt$$
D
$${1^ \circ }R - Br$$ (2 mol) $$+$$ potassium phthalimide followed by $${H_3}{O^ + }/$$ heat
Answer :
$${1^ \circ }R - N{H_2} + RCHO$$ followed by $${H_2}/Pt$$
35. An organic compound $$A$$ on reduction gives compound $$B$$ which on reaction with chloroform and potassium hydroxide forms $$C.$$ The compound $$C$$ on catalytic reduction gives $$N$$ - methylaniline. The compound $$A$$ is
A
nitrobenzene
B
nitromethane
C
methylamine
D
aniline
Answer :
nitrobenzene
36.
Identify $$X, Y$$ and $$Z$$ in the given reaction :
\[C{{H}_{2}}=C{{H}_{2}}\xrightarrow[CC{{l}_{4}}]{B{{r}_{2}}}X\] \[\xrightarrow[\left( 2\,\text{moles} \right)]{NaCN}Y\xrightarrow{LiAl{{H}_{4}}}Z\]
| $$X$$ | $$Y$$ | |
|---|---|---|
| (a) | $$C{H_2}BrC{H_2}Br$$ | $$C{H_3}C{H_2}C{H_2}CN$$ |
| (b) | $$C{H_2}BrC{H_2}Br$$ | $$C{H_3}C{H_2}CN$$ |
| (c) | $$C{H_3}C{H_2}Br$$ | $$C{H_3}C{H_2}CN$$ |
| (d) | $$C{H_2}BrC{H_2}Br$$ | $$NCC{H_2}C{H_2}CN$$ |
A
(a)
B
(b)
C
(c)
D
(d)
Answer :
(d)
37. The number of structural isomers possible from the molecular formula $${C_3}{H_9}N$$ is
A
4
B
5
C
2
D
3
Answer :
3
38.
What will be the final product in the following reaction sequence ?
\[C{{H}_{3}}C{{H}_{2}}CN\xrightarrow{{{H}^{+}}/{{H}_{2}}O}A\xrightarrow[\Delta ]{N{{H}_{3}}}B\xrightarrow{NaOBr}C\]
A
$$C{H_3}C{H_2}CON{H_2}$$
B
$$C{H_3}C{H_2}COBr$$
C
$$C{H_3}C{H_2}N{H_2}$$
D
$$C{H_3}C{H_2}C{H_2}N{H_2}$$
Answer :
$$C{H_3}C{H_2}N{H_2}$$
39.
$$'Z'$$ in the following sequence of reactions is
\[{{C}_{6}}{{H}_{6}}\xrightarrow[\Delta ]{HN{{O}_{3}}/{{H}_{2}}S{{O}_{4}}}W\xrightarrow{Sn/HCl}\] \[X\xrightarrow[HCl]{NaN{{O}_{2}}}Y\xrightarrow{{{H}_{2}}O/{{H}_{3}}P{{O}_{2}}}Z\]
A
B
C
D
Answer :
40. When primary amine reacts with chloroform in ethanolic $$KOH$$ then the product is
A
an isocyanide
B
an aldehyde
C
a cyanide
D
an alcohol
Answer :
an isocyanide