291. If two compounds have the same empirical formula but different molecular fomulae they must have
A
different percentage composition
B
different molecular weight
C
same viscosity
D
same vapour density
Answer :
different molecular weight
292. Acetamide is treated separately with the following reagents. Which one of these would give methylamine?
A
$$PC{l_5}$$
B
$$NaOH + B{r_2}$$
C
soda lime
D
hot conc. $${H_2}S{O_4}$$
Answer :
$$NaOH + B{r_2}$$
293.
\[\xrightarrow[{{H}_{2}}O]{B{{r}_{2}}}\left( A \right)\xrightarrow[\left( ii \right)\,{{H}_{3}}P{{O}_{2}}]{\left( i \right)\,NaN{{O}_{2}}/HCl}\left( B \right),\] Product $$(B)$$ in this reaction is :
A
B
C
D
Answer :
294.
\[\xrightarrow{{{\left( C{{H}_{3}}CO \right)}_{2}}O}A\xrightarrow{B{{r}_{2}}/C{{H}_{3}}COOH}B\xrightarrow{{{H}^{+}}/{{H}_{2}}O}X.\]
What is $$X?$$
A
B
C
D
Answer :
295.
Identify product $$D$$ in the following reaction sequence :
\[\xrightarrow[{{H}_{2}}O,\,\text{heat}]{{{K}_{2}}C{{r}_{2}}{{O}_{7}}:\,{{H}_{2}}S{{O}_{4}}}A\xrightarrow{SOC{{l}_{2}}}B\] \[\xrightarrow[\left( 2\,\,mole \right)]{{{\left( C{{H}_{3}} \right)}_{2}}NH}C\xrightarrow[\left( \text{ii} \right)\,{{H}_{2}}O]{\begin{smallmatrix}
\left( \text{i} \right)\,LiAl{{H}_{4}} \\
\text{diethyl ether}
\end{smallmatrix}}D\]
A
B
C
D
Answer :
296. The coupling reaction of aryldiazonium chloride with aniline are carried out in
A
strongly acidic medium
B
strongly basic medium
C
mild basic medium
D
mild acidic medium
Answer :
mild acidic medium
297.
What is the product of the following series of reactions ?
\[\xrightarrow[{{H}_{2}}O,\,0{{\,}^{\circ }}C]{NaN{{O}_{2}},\,HCl}\,\,\xrightarrow{CuCN}\,\,\xrightarrow[\left( 2 \right)\,{{H}_{2}}O,{{H}^{+}}]{\left( 1 \right)\,C{{H}_{3}}MgBr}\]
A
B
C
D
Answer :
298. Which one of the following is not an oxidation product of a primary amine ?
A
A hydroxylamine
B
A nitroso compound
C
A nitro compound
D
All of these
Answer :
All of these
299. \[{{C}_{7}}{{H}_{9}}N\] has how many isomeric forms that contain a benzene ring ?
A
4
B
5
C
6
D
7
Answer :
5
300. Reduction of nitrobenzene in presence of $$\frac{{Zn}}{{N{H_4}Cl}}$$ gives
A
aniline
B
azobenzene
C
nitrobenzene
D
phenylhydroxylamine
Answer :
phenylhydroxylamine
