51. Diethyl ether reacts, inspite of its usual inert nature, with :
A
Dilute suphuric acid
B
Dilute sodium hydroxide
C
Boron trifluoride
D
Metallic sodium
Answer :
Boron trifluoride
53.
In the given reactions, 
$$X$$ and $$Y$$ are respectively
A
bromobenzene and acetophenone
B
$$o$$ - and $$p$$ - bromophenol and salicylaldehdye
C
$$p$$ - bromophenol and salicylic acid
D
$$o$$ - bromophenol and benzoic acid
Answer :
$$o$$ - and $$p$$ - bromophenol and salicylaldehdye
54. $$C{H_3}C{H_2}OH$$ can be converted into $$C{H_3}CHO$$ by
A
catalytic hydrogenation
B
treatment with $$LiAl{H_4}$$
C
treatment with pyridinium chlorochromate
D
treatment with $$KMn{O_4}$$
Answer :
treatment with pyridinium chlorochromate
55. $$tert$$ - Butyl ethyl ether can’t be prepared by which reaction ?
A
$$tert$$ - Butanol + ethanol \[\xrightarrow{{{H}^{+}}}\]
B
$$tert$$ - Butyl bromide + sodium ethoxide \[\to \]
C
Sodium $$tert$$ - butoxide + ethyl bromide \[\to \]
D
Isobutene + ethanol \[\xrightarrow{{{H}^{+}}}\]
Answer :
$$tert$$ - Butyl bromide + sodium ethoxide \[\to \]
56. Among the following ethers which one will produce methyl alcohol on treatment with hot concentrated $$HI?$$
A
B
C
D
Answer :
gives $$C{H_3}OH$$ as one of the product. The reaction proceeds as
57. Which of the following is not a characteristic of alcohol?
A
They are lighter than water.
B
Their boiling points rise fairly uniformly with rising molecular weight.
C
Lower members are insoluble in water and organic solvents but the solubility regularly increases with molecular mass.
D
Lower members have a pleasant smell and burning taste, higher members are colourless and tasteless.
Answer :
Lower members are insoluble in water and organic solvents but the solubility regularly increases with molecular mass.
58. An alcohol $$X$$ on heating with concentrated $${H_2}S{O_4}$$ gives an alkene $$Y$$ which can show geometrical isomerism. The alcohol $$X$$ is
A
$$C{H_3}C{H_2}CH\left( {OH} \right)C{H_3}$$
B
$${\left( {C{H_3}} \right)_2}C\left( {OH} \right)CH{\left( {C{H_3}} \right)_2}$$
C
$${\left( {C{H_3}} \right)_3}C\left( {OH} \right)$$
D
$${\left( {C{H_3}} \right)_2}C\left( {OH} \right)C{H_2}C{H_3}$$
Answer :
$$C{H_3}C{H_2}CH\left( {OH} \right)C{H_3}$$
59.
Identify $$A, B$$ and $$C.$$
\[A\xrightarrow{C{{H}_{3}}MgBr}B\xrightarrow{{{H}_{3}}{{O}^{+}}}C\]
$$A$$
$$B$$
$$C$$
(a)
$$C{H_3}COC{H_3}$$
$${\left( {C{H_3}} \right)_3}COMgBr$$
$${\left( {C{H_3}} \right)_3}COH$$
(b)
$$C{H_3}COOH$$
$${\left( {C{H_3}} \right)_2}CHOMgBr$$
$$C{H_3}C{H_2}OH$$
(c)
$${\left( {C{H_3}COO} \right)_2}Ca$$
$$C{H_3}C{H_2}OMgBr$$
\[C{{H}_{3}}\underset{\begin{smallmatrix}
|\,\,\,\,\,\, \\
OH\,\,\,
\end{smallmatrix}}{\mathop{-CH-}}\,C{{H}_{3}}\]
(d)
$$C{H_3}COC{H_3}$$
$${\left( {C{H_3}} \right)_3}COMgBr$$
\[C{{H}_{3}}\underset{\begin{smallmatrix}
|\,\,\,\,\,\, \\
OH\,\,\,
\end{smallmatrix}}{\mathop{-CH-}}\,C{{H}_{3}}\]
A
(a)
B
(b)
C
(c)
D
(d)
Answer :
(a)
60.
Which of the following is the proper method to prepare $$n$$ - hexane from $$n$$ - propyl alcohol?
\[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH\xrightarrow{\left( X \right)}\] \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}Br\xrightarrow{\left( Y \right)}\] \[C{{H}_{3}}{{\left( C{{H}_{2}} \right)}_{4}}C{{H}_{3}}\]
A
$$\left( X \right)\,{\text{ - }}\,HBr{\text{,}}\left( Y \right)\,{\text{ - }}\,HCN$$
B
$$\left( X \right)\,{\text{ - }}\,HBr,\left( Y \right)\,{\text{ - }}\,Na,{\text{ether}}$$
C
$$\left( X \right)\,{\text{ - }}\,B{r_2},\left( Y \right)\,{\text{ - }}\,C{H_3}CN$$
D
$$\left( X \right)\,{\text{ - }}\,B{r_2},\left( Y \right)\,{\text{ - }}\,KMn{O_4}$$
Answer :
$$\left( X \right)\,{\text{ - }}\,HBr,\left( Y \right)\,{\text{ - }}\,Na,{\text{ether}}$$