131.
Various products formed on oxidation of 2, 5-dimethylhexan-3-one are
\[\begin{align}
& \left( \text{i} \right)C{{H}_{3}}\underset{\begin{smallmatrix}
|\,\,\,\,\,\, \\
C{{H}_{3}}\,\,
\end{smallmatrix}}{\mathop{-CH-}}\,COOH \\
& \left( \text{ii} \right)C{{H}_{3}}\underset{\begin{smallmatrix}
|\,\,\,\,\, \\
C{{H}_{3}}\,\,
\end{smallmatrix}}{\mathop{-CH-}}\,C{{H}_{2}}-COOH \\
& \left( \text{iii} \right)C{{H}_{3}}COOH \\
& \left( \text{iv} \right)HCOOH \\
\end{align}\]
A
(i) and (iii)
B
(i), (ii) and (iii)
C
(i), (ii), (iii) and (iv)
D
(iii) and (iv)
Answer :
(i), (ii), (iii) and (iv)
132. The final product $$(C)$$ obtained in the reaction sequence is \[C{{H}_{3}}C{{H}_{2}}COOH\xrightarrow{PC{{l}_{3}}}\left( A \right)\] \[\xrightarrow[AlC{{l}_{3}}]{{{C}_{6}}{{H}_{6}}}\left( B \right)\xrightarrow[\text{ base, heat}]{N{{H}_{2}}N{{H}_{2}}}\left( C \right)\]
A
B
C
D
Answer :
133. Tischenko reaction is a modification of :
A
Aldol condensation
B
Claisen condensation
C
Cannizzaro reaction
D
Pinacol-pinacolon reaction
Answer :
Cannizzaro reaction
\[\xrightarrow[50-{{60}^{\circ }},4\,hr]{{{C}_{6}}{{H}_{5}}C{{H}_{2}}ONa}\]
134.
In a set of reactions, acetic acid yielded a product $$D.$$
\[C{{H}_{3}}COOH\xrightarrow{SOC{{l}_{2}}}A\xrightarrow[\text{anhy}\text{.}\,\text{AlC}{{\text{l}}_{3}}]{\text{Benzene}}B\xrightarrow{HCN}C\xrightarrow{HOH}D\]
The structure of $$D$$ would be
A
B
C
D
Answer :
135. Which of the following reagents may be used to distinguish between phenol and benzoic acid?
A
Aqueous $$NaOH$$
B
Tollen’s reagent
C
Molisch reagent
D
Neutral $$FeC{l_3}$$
Answer :
Neutral $$FeC{l_3}$$
136. What happens when a carboxylic acid is treated with lithium aluminium hydride?
A
Aldehyde is formed.
B
Primary alcohol is formed.
C
Ketone is formed.
D
Grignard reagent is formed.
Answer :
Primary alcohol is formed.
137. Which of the following will not yield acetic acid on strong oxidation?
A
Butanone
B
Propanone
C
Ethyl ethanoate
D
Ethanol
Answer :
Ethyl ethanoate