221. Benzaldehyde can be prepared from benzene by passing vapours of _______ and _______ in its solution in presence of catalyst mixture of aluminium chloride and cuprous chloride. The reaction is known as _______ .
A
$$HCl,SnC{l_4},$$ Rosenmund reduction
B
$$CO,HCl,$$ Gattermann-Koch reaction
C
$$C{O_2},{H_2}S{O_4},$$ Clemmensen reduction
D
$${O_3},$$ Wolff-Kishner reduction
Answer :
$$CO,HCl,$$ Gattermann-Koch reaction
222.
The product of acid hydrolysis of $$P$$ and $$Q$$ can be
distinguished by
A
Lucas Reagent
B
\[2,4-DNP\]
C
Fehling’s Solution
D
\[NaHS{{O}_{3}}\]
Answer :
Fehling’s Solution
223. An organic compound $$(X)$$ with molecular formula $${C_9}{H_{10}}O$$ gives positive 2, 4-$$DNP$$ and Tollens' tests. It undergoes Cannizzaro reaction and on vigorous oxidation it gives 1, 4-benzenedicarboxylic acid. Compound $$(X)$$ is
A
benzaldehyde
B
$$o$$ - methylbenzaldehyde
C
$$p$$ - ethylbenzaldehyde
D
2, 2-dimethylhexanal.
Answer :
$$p$$ - ethylbenzaldehyde
224.
\[\xrightarrow{HN{{O}_{3}}}\left( A \right)\xrightarrow{Ca{{\left( OH \right)}_{2}}}\left( B \right)\]
Product $$(B)$$ in this reaction is :
A
B
C
D
Answer :
225. Clemmensen reduction of a ketone is carried out in the presence of :
A
$$LiAl{H_4}$$
B
$$Zn - Hg$$ with $$HCl$$
C
Glycol with $$KOH$$
D
$${H_2}$$ with $$Pt$$ as catalyst
Answer :
$$Zn - Hg$$ with $$HCl$$
226. Polarisation of electrons in acrolein may be written as
A
$$\mathop {C{H_2}}\limits^{{\delta ^ - }} = CH - \mathop {CH}\limits^{{\delta ^ + }} = O$$
B
$$\mathop {C{H_2}}\limits^{{\delta ^ - }} = CH - CH = \mathop O\limits^{{\delta ^ + }} $$
C
$$\mathop {C{H_2}}\limits^{{\delta ^ - }} = \mathop {CH}\limits^{{\delta ^ + }} - CH = O$$
D
$$\mathop {C{H_2}}\limits^{{\delta ^ + }} = CH - CH = \mathop O\limits^{{\delta ^ - }} $$
Answer :
$$\mathop {C{H_2}}\limits^{{\delta ^ + }} = CH - CH = \mathop O\limits^{{\delta ^ - }} $$
227. Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by the elimination of water. The reagents is
A
a Grignard reagent
B
hydrazine in presence of feebly acidic solution
C
hydrocyanic acid
D
sodium hydrogen sulphite
Answer :
hydrazine in presence of feebly acidic solution
228. Which of the following reagents are not correctly matched with the reaction?
A
$$C{H_3}CH = CHCHO \to C{H_3}CH$$ $$ = CHCOOH:{\text{Ammoniacal}}\,\,AgN{O_3}$$
B
$$C{H_3}CH = CHCHO \to C{H_3}CH$$ $$ = CHC{H_2}OH:{H_2}/Pt$$
C
$$R - COOH \to R - C{H_2}OH:NaB{H_4}$$
D
$$C{H_3}C{H_2}COCl \to C{H_3}C{H_2}CHO$$ $$:{H_2},Pd/BaS{O_4}$$
Answer :
$$C{H_3}CH = CHCHO \to C{H_3}CH$$ $$ = CHC{H_2}OH:{H_2}/Pt$$
