91.
What is the product of the following sequence of reactions ?
\[{{\left( C{{H}_{3}} \right)}_{2}}C=CH.C{{H}_{2}}C{{H}_{3}}\] \[\xrightarrow[\left( \text{ii} \right)\,{{H}_{2}}{{O}_{2}},O{{H}^{-}}]{\left( \text{i} \right)\,B{{H}_{3}}/THF}\,\,\xrightarrow[C{{H}_{2}}C{{l}_{2}}]{PCC}\] \[\xrightarrow[\left( \text{ii} \right)\,{{H}_{3}}{{O}^{+}}]{\left( \text{i} \right)\,C{{H}_{3}}MgBr}\]
A
2, 4 - dimethyl - 3 - pentanol
B
2, 3 - dimethyl - 3 - pentanol
C
2, 3 - dimethyl - 2 - pentanol
D
2, 2 - dimethyl - 3 - pentanol
Answer :
2, 3 - dimethyl - 3 - pentanol
92. Phenol is heated with a solution of mixture of $$KBr$$ and $$KBr{O_3}.$$ The major product obtained in the above reaction is
A
2-bromophenol
B
3-bromophenol
C
4-bromophenol
D
2, 4, 6-tribromophenol
Answer :
2, 4, 6-tribromophenol
93. The product of acid catalyzed hydration of 2 - phenylpropene is
A
3 - phenyl - 2 - propanol
B
1 - phenyl - 2 - propanol
C
2 - phenyl - 2 - propanol
D
2 - phenyl - 1 - propanol
Answer :
2 - phenyl - 2 - propanol
94. Which of the following diols would cleave into two fragments with $$HI{O_4}$$
A
1, 3 - hexanediol
B
2, 4 - hexanediol
C
1, 6 - hexanediol
D
3, 4 - hexanediol
Answer :
3, 4 - hexanediol
95. Which of the following statements is not correctly showing the trend of the properties mentioned?
A
$$C{H_3}C{H_2}OH > C{H_3}C{H_2}C{H_2}OH$$ $$ > \mathop {C{H_3}C{H_2}C{H_2}C{H_2}OH}\limits_{\left( {{\text{Solubility}}} \right)} $$
B
$$C{H_3}C{H_2}OH < C{H_3}C{H_2}C{H_2}OH$$ $$ < \mathop {C{H_3}C{H_2}C{H_2}C{H_2}OH}\limits_{\left( {{\text{Boiling point}}} \right)} $$
C
\[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH>\underset{\begin{smallmatrix}
| \\
\,\,\,\,C{{H}_{3}}
\end{smallmatrix}}{\mathop{C{{H}_{3}}CH-}}\,\] \[C{{H}_{2}}OH>\underset{\left( \text{Boiling point} \right)}{\mathop{C{{H}_{3}}\underset{\begin{smallmatrix}
| \\
\,\,\,\,C{{H}_{3}}
\end{smallmatrix}}{\overset{\begin{smallmatrix}
\,\,\,\,\,C{{H}_{3}} \\
|
\end{smallmatrix}}{\mathop{-C-}}}\,OH}}\,\]
D
\[C{{H}_{3}}\underset{\begin{smallmatrix}
| \\
\,\,\,\,C{{H}_{3}}
\end{smallmatrix}}{\overset{\begin{smallmatrix}
\,\,\,\,\,C{{H}_{3}} \\
|
\end{smallmatrix}}{\mathop{-C-}}}\,OH>\underset{\begin{smallmatrix}
| \\
\,\,\,\,C{{H}_{3}}
\end{smallmatrix}}{\mathop{C{{H}_{3}}CH-}}\,\] $$C{H_2}OH > \mathop {C{H_3}C{H_2}C{H_2}C{H_2}OH}\limits_{\left( {{\text{Boiling point}}} \right)} $$
Answer :
\[C{{H}_{3}}\underset{\begin{smallmatrix}
| \\
\,\,\,\,C{{H}_{3}}
\end{smallmatrix}}{\overset{\begin{smallmatrix}
\,\,\,\,\,C{{H}_{3}} \\
|
\end{smallmatrix}}{\mathop{-C-}}}\,OH>\underset{\begin{smallmatrix}
| \\
\,\,\,\,C{{H}_{3}}
\end{smallmatrix}}{\mathop{C{{H}_{3}}CH-}}\,\] $$C{H_2}OH > \mathop {C{H_3}C{H_2}C{H_2}C{H_2}OH}\limits_{\left( {{\text{Boiling point}}} \right)} $$
96. An ether $$\left( A \right),{C_5}{H_{12}}O,$$ when heated with excess of hot concentrated $$HI$$ produced two alkyl halides which when treated with $$NaOH$$ yielded compounds $$(B)$$ and $$(C).$$ Oxidation of $$(B)$$ and $$(C)$$ gave a propanone and an ethanoic acid respectively. The $$IUPAC$$ name of the ether $$(A)$$ is :
A
2 - ethoxypropane
B
ethoxypropane
C
methoxybutane
D
2 - methoxybutane
Answer :
2 - ethoxypropane
97. The reaction between phenol and chloroform in the presence of aqueous $$NaOH$$ is
A
nucleophilic substitution reaction
B
electrophilic addition reaction
C
electrophilic substitution reaction
D
nucleophilic addition reaction
Answer :
electrophilic substitution reaction
98.
Which reducing agent is used for the following conversion?
$$RCOOH \to RC{H_2}OH$$
A
$$LiAl{H_4}$$
B
$$NaB{H_4}$$
C
$${K_2}C{r_2}{O_7}$$
D
$$KMn{O_4}$$
Answer :
$$LiAl{H_4}$$
99. Which of the following alcohols is dehydrated most readily with $$conc.\,{H_2}S{O_4}?$$
A
B
C
D
Answer :
100.
In the following reaction.
\[{{C}_{2}}{{H}_{5}}O{{C}_{2}}{{H}_{5}}+4H\xrightarrow{\text{Red}\,\,P+HI}2X+{{H}_{2}}O\,;X\] is
A
ethane
B
ethylene
C
butane
D
propane
Answer :
ethane