81.
The final product of the following sequence of reactions is
\[\xrightarrow[\text{benzoyl peroxide}]{NBS,\,CC{{l}_{4}},\,\text{heat}}\,\,\xrightarrow[C{{O}_{2}}]{Mg\text{/ether}}\] \[\xrightarrow{{{H}_{3}}{{O}^{+}}}?\]
A
B
C
D
Answer :
82.
The correct product of the following sequence of reactions
\[{{\left( C{{H}_{3}} \right)}_{2}}CHCOOH\xrightarrow[\left( \text{ii} \right)\,{{H}_{2}}O]{\left( \text{i} \right)\,LiAl{{H}_{4}}}\] \[\xrightarrow{PB{{r}_{3}}}\,\,\xrightarrow[DMSO]{KCN}\,\,\xrightarrow[\Delta ]{{{H}_{2}}{{O}^{+}},\,{{H}^{+}}}\]
A
\[{{\left( C{{H}_{3}} \right)}_{2}}CHCH\,Br.COOH\]
B
\[{{\left( C{{H}_{3}} \right)}_{2}}CHC{{H}_{2}}COOH\]
C
\[{{\left( C{{H}_{3}} \right)}_{2}}CHC{{H}_{2}}C{{H}_{2}}N{{H}_{2}}\]
D
\[{{\left( C{{H}_{3}} \right)}_{2}}C=CHCOOH\]
Answer :
\[{{\left( C{{H}_{3}} \right)}_{2}}CHC{{H}_{2}}COOH\]
83.
The major product obtained in the following reaction is :
A
B
C
D
Answer :
84. Among the following acids which has the lowest $$p{K_a}$$ value ?
A
$$C{H_3}C{H_2}COOH$$
B
$${\left( {C{H_3}} \right)_2}CH - COOH$$
C
$$HCOOH$$
D
$$C{H_3}COOH$$
Answer :
$$HCOOH$$
85. Oxidation of acetaldehyde with selenium dioxide produces
A
ethanoic acid
B
methanoic acid
C
glyoxal
D
oxalic acid
Answer :
glyoxal
86. Sodium ethoxide has reacted with ethanoyl chloride. The compound that is produced in the above reaction is :
A
Diethyl ether
B
2 - Butanone
C
Ethyl chloride
D
Ethyl ethanoate
Answer :
Ethyl ethanoate
87. The order of decreasing ease of reaction with ammonia is
A
anhydrides, esters, ethers
B
anhydrides, ethers, esters
C
ethers, anhydrides, esters
D
esters, ethers, anhydrides
Answer :
anhydrides, esters, ethers
88.
In a set of reactions, ethyl benzene yielded a product $$D.$$
\[\xrightarrow[KOH]{KMn{{O}_{4}}}B\xrightarrow[FeC{{l}_{3}}]{B{{r}_{2}}}\] \[C\xrightarrow[{{H}^{+}}]{{{C}_{2}}{{H}_{5}}OH}D\]
$$D$$ would be
A
B
C
D
Answer :
89. Benzoic acid gives benzene on being heated with $$X$$ and phenol gives benzene on being heated with $$Y.$$ Therefore, $$X$$ and $$Y$$ are respectively
A
sodalime and copper
B
$$Zn$$ dust and $$NaOH$$
C
$$Zn$$ dust and sodalime
D
sodalime and zinc dust
Answer :
sodalime and zinc dust
90.
\[\xrightarrow[\left( \text{ii} \right)\,{{H}_{2}}O/{{H}^{+}}]{\left( \text{i} \right)\,KOH/\Delta }\left[ X \right].\] What is $$[X]?$$
A
B
C
D
Answer :