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JEE Questions for Chemistry Aldehydes Ketones And Carboxylic Acids Quiz 8 - MCQExams.com
JEE
Chemistry
Aldehydes Ketones And Carboxylic Acids
Quiz 8
Upon treatment with Al(OEt)
3
followed by usual reactions (work up) CH
3
CHO will produce
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Only CH3 COOCH2 CH3
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a mixture of CH3 COOH and EtOH
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Only CH3 COOH
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Only EtOH
The major product of the following reaction is
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a hemiacetal
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an acetal
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an ether
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an ester
Trichloroacetaldehyde was subjected to Cannizzaro's reaction by using NaOH. The mixture of the products contains sodium trichloroacetate ion and another compound. The other compound is
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2, 2, 2-trichlorethanol
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trichloromethanol
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2, 2, 2-trichloropropanol
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chloroform
Which of the following reactions convert acetone into hydrocarbon having same number of carbon atoms?
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Wolff-Kishner reaction
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Hofmann reaction
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Grignard reaction
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Reduction with LiAlH4
In the scheme given below, the total number of intramolecular aldol condensation products formed from `
Y
' is
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1
0%
2
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3
0%
4
The compound obtained when acetaldehyde reacts with dilute aqueous sodium hydroxide exhibits
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geometrical isomerism
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optical isomerism
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neither optical nor geometrical isomerism
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both optical and geometrical isomerism
Identify the reaction which is used to obtain β- hydroxy ketone.
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Condensation reaction
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Aldol condensation
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Cross aldol condensation
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Cannizzaro reaction
The most reactive compound towards formation of cyanohydrin on treatment with HCN followed by acidification is
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benzaldehyde
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p-nitrobenzaldehyde
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phenylacetaldehyde
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p-hydroxybenzaldehyde
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0%
2)
0%
0%
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butanol
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aldol
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ketol
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acetal
A compound `
A
' having the molecular formula C
5
H
12
O, on oxidation gives a compound 'B' with molecular formula C
5
H
10
O. Compound '
B
' gave a 2, 4-dinitrophenylhy-drazine derivative but did not answer haloform test or silver minor test. The structure of compound `
A
' is
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CH3 —CH2—CH2 —CH2 —CH2 —OH
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2)
0%
0%
0%
Which of the following compounds would be the main product of an aldol condensation of acetaldehyde and acetone?
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CH3CH = CH∙CHO
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CH3CH = CHCOCH3
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(CH3)2C = CH∙CHO
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(CH3)2C = CHCOCH3
An organic compound of molecular formula C
3
H
6
O did not give a silver mirror with Tollen's reagent, but gave an oxime with hydroxylamine, it may be
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CH3— CO—CH3
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C2 H5CHO
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CH2 = CH—CH2—OH
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CH3— O—CH = CH2
In a reaction
R
CHO is reduced to
R
CH
3
using amalgamated zinc and concentrated HCl and warming the solution. The reaction is known as
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Meerwein-Ponndorf reaction
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Clemmensen's reduction
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Wolff-Kishner reduction
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Schiff s reaction
Which of the following reactions can be used to change benzaldehyde to cinnamic acid?
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Perkin's reaction
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Knoevenagel reaction
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Reformatsky reaction and ketones
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Benzoin condensation
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Only I
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Only II
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I and III
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II and III
Which product is obtained on reduction of methanal in the presence of concentrated NaOH?
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Formic acid and methyl alcohol
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CO + H2
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Methyl alcohol
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Formic acid
An aromatic compound `
X
' with molecular formula C
9
H
10
O gives the following chemical tests I. Forms 2, 4-DNP derivative, II. Reduces Tollen's reagent, III. Undergoes Cannizzaro reaction and, IV. On vigorous oxidation 1, 2- benzenedicarboxylic acid is obtained.
X
is
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0%
2)
0%
0%
In the following reaction sequence, the correct structures of
E ,F
and
G
are
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0%
2)
0%
0%
Acetone on addition to methyl magnesium bromide forms a complex, which on decomposition with acid gives
X
and Mg(OH)Br. Which one of the following is
X
?
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CH3OH
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(CH3)3 COH
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(CH3 )2 CHOH
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CH3CH2 OH
The end product '
C
' in the following sequence of chemical reactions is
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acetaldehyde oxime
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formaldehyde oxime
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methyl nitrate
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acetoxime
Which reaction, intermediate is formed during the condensation reaction between acetaldehyde and formaldehyde ?
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0%
2)
0%
0%
The reactant (
X
) in the reaction,
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0%
2)
0%
0%
Which of the following, is an example of aldol condensation?
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0%
2)
0%
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None of the above
p
-cresol reacts with chloroform in alkaline medium to give the compound
A
which adds hydrogen cyanide to form the compound
B
. The latter on acidic hydrolysis gives chiral carboxylic acid. The structure of the carboxylic acid is
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2)
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Predict the product,
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2)
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0%
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2)
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0%
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2)
0%
0%
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0%
2)
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0%
Claisen condensation is not given by
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0%
2)
0%
0%
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