41.
Identify the missing reagent in the reaction given below
\[\xrightarrow[\left( \text{ii} \right)\,{{H}_{3}}{{O}^{+}}]{\left( \text{i} \right)\,EtONa}\] 
A
Diethyl carbonate \[{{\left( EtO \right)}_{2}}C=O\]
B
Ethyl acetate \[C{{H}_{3}}COOEt\]
C
Ethyl formate $$HCOOEt$$
D
Diethyl oxalate \[Et.\,OOC.\,COOEt\]
Answer :
Diethyl carbonate \[{{\left( EtO \right)}_{2}}C=O\]
\[X+{{H}_{2}}O\]
43. Formic acid is obtained when
A
calcium acetate is heated with $$conc.\,{H_2}S{O_4}$$
B
calcium formate is heated with calcium acetate
C
glycerol is heated with oxalic acid at $$373$$ $$K$$
D
acetaldehyde is oxidised with $${K_2}C{r_2}{O_7}$$ and $${H_2}S{O_4}$$
Answer :
glycerol is heated with oxalic acid at $$373$$ $$K$$
44. 4 - Methylbenzenesulphonic acid reacts with sodium acetate to give
A
B
C
D
Answer :
with a benzylic hydrogen into benzoic acid.
46.
The correct order of increasing acid strenght of the
compounds
A
D < A < B < C
B
A < D < B < C
C
B < D < A < C
D
D < A < C < B
Answer :
D < A < B < C
47. A colourless liquid, at room temperature, reacts with soda-lime to form sodium salt of a carboxylic acid and ammonia gas. The liquid is
A
propanoic acid
B
formamide
C
propanamide
D
methyl enthanoate
Answer :
formamide
48. In the reaction, \[C{{H}_{3}}COOH\xrightarrow{LiA{{H}_{4}}}A\xrightarrow{PC{{l}_{5}}}\] \[B\xrightarrow{Alc.\,KOH}C,\] the product $$C$$ is :
A
Acetaldehyde
B
Acetylene
C
Ethylene
D
Acetyl chloride
Answer :
Ethylene
49. Which one of the following esters cannot undergo Claisen self-condensation ?
A
$$C{H_3}C{H_2}C{H_2}C{H_2}COO{C_2}{H_5}$$
B
$${C_6}{H_5}COO{C_2}{H_5}$$
C
$${C_6}{H_5}C{H_2}COO{C_2}{H_5}$$
D
$${C_6}{H_{11}}C{H_2}COO{C_2}{H_5}$$
Answer :
$${C_6}{H_5}COO{C_2}{H_5}$$
50.
Which is the most suitable reagent for the following conversion?
\[C{{H}_{3}}-CH=CH-C{{H}_{2}}\overset{\begin{smallmatrix}
O \\
\parallel
\end{smallmatrix}}{\mathop{-C-}}\,C{{H}_{3}}\] \[\to C{{H}_{3}}-CH=CH-C{{H}_{2}}\overset{\begin{smallmatrix}
O \\
\parallel
\end{smallmatrix}}{\mathop{-C-}}\,OH\]
A
Tollens' reagent
B
Benzoyl peroxide
C
\[{{I}_{2}}\] and $$NaOH$$ solution
D
$$Sn$$ and $$NaOH$$ solution
Answer :
\[{{I}_{2}}\] and $$NaOH$$ solution