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CBSE Questions for Class 12 Engineering Chemistry Aldehydes,Ketones And Carboxylic Acids Quiz 3 - MCQExams.com
CBSE
Class 12 Engineering Chemistry
Aldehydes,Ketones And Carboxylic Acids
Quiz 3
C
H
3
C
H
=
C
H
C
H
O
is oxidised to
C
H
3
−
C
H
=
C
H
C
O
O
H
, using oxidising agent as :
Report Question
0%
alkaline
K
M
n
O
4
0%
K
2
C
r
2
O
7
/
c
o
n
c
.
H
2
S
O
4
0%
ammoniacal
A
g
N
O
3
0%
dilute4
H
N
O
3
Explanation
C
H
3
C
H
=
C
H
C
H
O
+
[
O
]
→
C
H
3
−
C
H
=
C
H
C
O
O
H
on analyzing above reaction we find that we have to use that oxidizing agent which retain the double bond and oxidized
−
C
H
O
into
−
C
O
O
H
.
Now,
we have Option A,B,and D are strong oxidizing agent which can oxidised
−
C
H
O
a
s
w
e
l
l
a
s
d
o
u
b
l
e
Thus, we will use mild oxidising agent
a
m
m
o
n
i
c
a
l
A
g
N
O
3
(
T
o
l
l
e
n
′
s
r
e
a
g
e
n
t
)
to carry out above reaction.
In which of the following delocalisation of
π
-electrons is possible?
Report Question
0%
C
H
2
=
C
H
−
C
H
2
−
C
H
O
0%
C
H
2
=
C
H
−
C
H
=
O
0%
C
H
2
=
C
H
2
0%
C
H
2
=
C
H
−
C
H
2
−
C
H
=
C
H
2
IUPAC name of the given compound is:
Report Question
0%
Methyl salicylate
0%
2 - hydroxy-methylbenzoate
0%
Methyl - o - hydroxybenzoate
0%
Methyl - 2 - hydroxy salicylate
An organic compound
x
which is used as a preservative in pickles on reaction with another organic compound
y
used in the tincture in the presence of an acid gives a product which is a sweet-smelling substance
z
.
x
,
y
,
z
respectively are:
Report Question
0%
Ethanoic Acid, Ethanol, Ethyl Acetate
0%
Ethanol, Propanoic Acid, Ethyl Ethanoate
0%
Ethanol, Carbolic Acid, Ethyl Ethanoate
0%
None of the above
Reactivity of alkenes towards HX decreases in the order -
Report Question
0%
Butene > Propene > Ethene
0%
Butene > Ethene > Propene
0%
Ethene > Propene > Butene
0%
None of these
Give a decreasing order of the following towards NA reaction.
Report Question
0%
(
I
)
>
(
I
I
)
>
(
I
I
)
>
(
I
V
)
0%
(
I
V
)
>
(
I
I
I
)
>
(
I
I
)
>
(
I
)
0%
(
I
I
)
>
(
I
I
I
)
>
(
I
V
)
>
(
I
)
0%
(
I
)
>
(
I
V
)
>
(
I
I
)
>
(
I
I
)
Molecular formula
C
5
H
10
O
can have:
Report Question
0%
6- Aldehyde, 4- Ketone
0%
5- Aldehyde, 3- Ketone
0%
4- Aldehyde, 3- Ketone
0%
5- Aldehyde, 2- Ketone
Which of the following has maximum enol content ?
Report Question
0%
C
H
3
C
H
O
0%
0%
C
H
3
C
O
C
H
2
C
H
O
0%
Arrange the following in increasing order of their
p
K
a
values.
Report Question
0%
y
<
x
<
z
0%
x
<
y
<
z
0%
y
<
z
<
x
0%
x
<
z
<
y
Acetaldehyde reacts with
P
C
l
5
to give:
Report Question
0%
ethyl chloride
0%
ethylene chloride
0%
ethylidene dichloride
0%
trichloroacetaldehyde
Which substance is used in leather industry?
Report Question
0%
Methanoic acid
0%
Ethanoic acid
0%
Benzoic acid
0%
Pentanoic acid
Among the following achiral amino acid is:
Report Question
0%
Ethylalanine
0%
Methylglycine
0%
2 - Hydroxymethylserine
0%
Tryptohan
Which is/are examples of organic compounds containing the carbonyl group?
Report Question
0%
Aldehydes
0%
Ketones
0%
Carboxylic acid
0%
All of these
Which of the following compound does not react with sodium bisulphite?
Report Question
0%
Benzaldehyde
0%
Acetophenone
0%
Acetone
0%
Acetaldehyde
Which of the following is correct for
K
a
values. ( Acidic strength )
Report Question
0%
C
H
3
C
O
2
H
>
C
H
3
C
H
2
O
H
0%
H
2
O
>
C
2
H
5
O
H
>
N
H
3
>
H
C
≡
C
H
>
C
H
2
≡
C
H
2
>
C
H
3
−
C
H
3
0%
H
C
O
O
H
>
C
H
3
−
C
O
O
H
>
P
h
C
O
O
H
0%
None of these
Lowest
p
K
a
is associated with
Report Question
0%
0%
0%
0%
Which is the best method for carrying out the following reaction ?
Report Question
0%
+
C
O
O
H
;
H
N
O
3
/
H
2
S
O
4
0%
C
H
3
C
l
/
A
l
C
l
3
;
H
N
O
3
/
H
2
S
O
4
;
K
M
n
O
4
/
H
+
,
h
e
a
t
0%
C
H
3
C
l
/
A
l
C
l
3
;
K
M
n
O
4
/
H
+
,
h
e
a
t
;
H
N
O
3
/
H
2
S
O
4
0%
H
N
O
3
/
H
2
S
O
4
;
C
H
3
C
l
/
A
l
C
l
3
;
K
M
n
O
4
/
H
+
,
h
e
a
t
Reaction of aldehydes and ketones with which reagent gives oxime?
Report Question
0%
N
H
2
−
N
H
2
0%
N
H
3
0%
C
6
H
5
−
N
H
−
N
H
2
0%
N
H
2
O
H
C
H
3
−
C
H
2
−
C
H
O
1
)
N
H
2
O
H
/
Δ
→
2
)
(
C
H
3
C
O
)
2
O
,
3
)
H
3
O
+
′
X
′
Then 'X' is
Report Question
0%
C
H
3
C
O
O
H
0%
C
H
3
−
C
H
2
−
C
O
O
H
0%
C
H
3
C
O
N
H
2
0%
C
H
3
C
H
2
C
H
O
Which of the following statement is not true?
Report Question
0%
Aldehyde and ketone give nucleophilic addition reactions.
0%
Aldehyde and ketone give electrophilic addition reactions.
0%
Aldehyde and ketones possess a polar carbonyl group.
0%
Aldehydes and ketones having lower molar mass are soluble in water due to H-bond.
Which of the following is an example of nucleophilic addition reaction?
Report Question
0%
C
H
≡
C
H
+
C
l
2
→
C
H
C
l
=
C
H
C
l
0%
C
H
≡
C
H
H
C
l
,
C
H
3
C
O
O
H
→
C
H
2
=
C
H
C
l
0%
C
H
≡
C
H
N
a
N
H
2
→
C
H
≡
C
−
N
a
+
0%
C
H
≡
C
H
+
H
2
O
H
+
,
H
g
2
+
/
Δ
→
C
H
3
C
H
O
p
K
a
value is least for:
Report Question
0%
0%
0%
0%
The systematic name of
(
C
H
3
)
2
C
H
−
C
O
O
H
Report Question
0%
2-Propanoic acid
0%
Isobutanoic acid
0%
2-Methyl propanoic acid
0%
2-Methyl butanoic acid
IUPAC name of
C
H
3
C
H
2
C
H
2
C
O
C
H
3
is
Report Question
0%
2-pentanone
0%
Pentan-2-one
0%
Pentanone-2
0%
all the above
Which one is most reactive towards nucleophilic addition reaction?
Report Question
0%
0%
0%
0%
In the following sequence of reactions
T
o
l
u
e
n
e
K
M
n
O
4
→
A
S
O
C
l
2
→
B
H
2
/
P
d
→
B
a
S
O
4
C
; then product
C
is:
Report Question
0%
C
6
H
5
C
O
O
H
0%
C
6
H
5
C
H
3
0%
C
6
H
5
C
H
2
O
H
0%
C
6
H
5
C
H
O
Explanation
The oxidation of toluene with
K
M
n
O
4
gives benzoic acid.
Thionyl chloride converts carboxylic group to acid chloride.
Reaction with hydrogen in presence of palladium and barium sulphate gives benzaldehyde.
Option D is correct.
The IUPAC name of the following compound is :
H
3
C
−
C
H
3
|
C
H
−
O
H
|
C
H
−
C
H
2
−
C
O
O
H
Report Question
0%
2-Methyl-3-hydroxypentan-5-oic-acid
0%
4,4-Dimethyl-3-hydroxy butanoic acid
0%
3-Hydroxy-4-methylpentanoic acid
0%
4-Methyl-3- hydroxypentanoic acid
Explanation
Solution:- (C)
3
-Hydroxy-
4
-methylpetanoic acid
C
5
H
3
−
C
H
3
|
C
4
H
−
3
C
|
O
H
H
−
2
C
H
2
−
1
C
O
O
H
Pyruvic acid is obtained by:
Report Question
0%
oxidation of acetaldehyde cyanohydrin
0%
oxidation of formaldehyde cyanohydrin
0%
oxidation of acetone cyanohydrin
0%
None of the above
Explanation
Acetaldehyde with HCN gives acetaldehyde cyanohydrin
C
H
3
C
H
O
+
H
C
N
⟶
C
H
3
C
H
(
C
N
)
−
O
H
on oxidation it gives,
C
H
3
C
H
(
C
N
)
−
O
H
⟶
C
H
3
C
H
(
O
H
)
−
C
O
O
H
C
H
3
C
H
(
O
H
)
−
C
O
O
H
⟶
C
H
3
C
(
C
O
O
H
)
=
O
gives pyruvic acid.
(
1
)
C
6
H
5
−
O
|
|
C
−
C
6
H
5
(
2
)
C
6
H
5
−
C
H
O
(
3
)
p
−
C
H
3
−
C
6
H
4
−
C
H
O
(
4
)
p
−
C
H
3
O
−
C
6
H
4
−
C
H
O
Correct order for nucleophilic addition reaction.
Report Question
0%
2
>
1
>
3
>
4
0%
4
>
3
>
2
>
1
0%
2
>
3
>
4
>
1
0%
4
>
2
>
3
>
1
Explanation
Reactivity of carbonyl compounds towards nucleophilic addition reaction depends on the presence of substituted group. Aldehydes are more reactive than ketone for nucleophilic addition reaction.
Electron withdrawing
(
−
I
,
−
M
)
group increased reactivity towards nucleophilic addition reaction.
As the
−
O
C
H
3
and
C
H
3
groups shows
+
R
and
+
I
effect hence the reactivity decreases.
Thus the correct order is-
2
>
3
>
4
>
1
Find the product of the given reaction:
Report Question
0%
0%
0%
0%
Which of the following is IUPAC name of compound?
Report Question
0%
1, 4-dichloro-2, 6-dioxo-4-carboxyl-1-oic acid
0%
2, 4-dioxo-1, 4-dichlorohexane-1-carboxylic acid
0%
1, 4-dichloro-2, 4, 6-dioxoxyxlohexane-1-carboxylic acid
0%
1, 4-dichloro-4-formyl-2, 6-dioxo cyclohexane-1-carboxylic acid
The carbonyl carbon is:
Report Question
0%
electrophilic
0%
nucleophilic
0%
amphoteric
0%
lewis base
Explanation
The carbon-oxygen double bond is polarised due to higher electronegativity of oxygen relative to carbon. Hence, the carbonyl carbon is an electrophilic (lewis acid) and carbonyl oxygen is, a nucleophilic (lewis base) centre.
Which of the following is the functional group for carboxylic acids?
Report Question
0%
0%
0%
-OH
0%
Ethanoic acid is obtained by the ..... of ethanol.
Report Question
0%
Combustion
0%
Oxidation
0%
Reduction
0%
Subsitution
Explanation
Alcohols get oxidised to carboxylic acids with the help of alkaline
K
M
n
O
4
or acidified
K
2
C
r
2
O
7
.
C
2
H
5
O
H
A
l
k
.
K
M
n
O
4
or Acidic
K
2
C
r
2
O
7
C
H
3
C
O
O
H
Ethanoic acid is obtained by the oxidation of ethanol.
H
C
H
O
R
e
d
u
c
t
i
o
n
→
A
P
a
n
d
I
2
→
B
K
C
N
→
C
H
y
d
r
o
l
y
s
i
s
→
D
What is
D
?
Report Question
0%
Acetic acid
0%
Ethylamine
0%
Acetamide
0%
None of these
Explanation
H
C
H
O
m
e
t
h
a
n
a
l
R
e
d
u
c
t
i
o
n
→
C
H
3
O
H
m
e
t
h
a
n
o
l
(
A
)
P
+
I
2
→
C
H
3
I
m
e
t
h
y
l
i
o
d
i
d
e
(
B
)
K
C
N
→
C
H
3
C
N
m
e
t
h
y
l
c
y
a
n
i
d
e
(
C
)
H
y
d
r
o
l
y
s
i
s
→
C
H
3
C
O
O
H
a
c
e
t
i
c
a
c
i
d
(
D
)
Lower aldehyde and ketones attributed to the formation of ______bonding with water molecules.
Report Question
0%
Sigma bonding
0%
pii bonding
0%
Covalent bonding
0%
Hydrogen bonding
Explanation
Lower members of aldehydes and ketones are misible with water because they form hydrogen bonds with water. The carbonyl carbon is electrophillic (lewis acid) and carbonyl oxygen is nuceophillic (lewis base). The dipole movement of carbonyl compounds is due to the highly polar character of the carbonyl group.
Which of the following is the functional group for carboxylic acids?
Report Question
0%
0%
0%
0%
Explanation
The carboxyl functional group that caracterizes the carboxylic acid is unusual in that it is composed of two functional group : (1) the carboxyl group and (2) of a hydroxyl group bonded to a carbonyl group . It is often written in condensed form as
–
C
O
2
H
or
–
C
O
O
H
.
In the presence of
H
2
S
O
concentrated sulphuric acid, acetic acid reacts with ethyl alcohol to produce :
Report Question
0%
Aldehyde
0%
Alcohol
0%
Ester
0%
Carboxylic acid
Explanation
C
H
3
C
O
O
H
+
C
2
H
5
O
H
C
O
N
C
.
H
2
S
O
4
→
C
H
3
C
O
O
C
2
H
5
+
H
2
O
(ester)
This reaction is known as esterification.
Ketones reacts with Mg - Hg over water and give:
Report Question
0%
Alcohols
0%
pinacolones
0%
pinacols
0%
none of these
Explanation
Ketones reacts with Mg-Hg over water gives pinacols.
Hence, option C is correct.
Which has a smell of oil of winter green?
Report Question
0%
Ethyl salicylate
0%
Methyl salicylate
0%
Benzaldehyde
0%
Phenyl salicylate
Explanation
Methyl salicylate (oil of wintergreen or wintergreen oil) is an organic compound with the formula
C
6
H
4
(
O
H
)
(
C
O
2
C
H
3
)
.
It is produced by many species of plants, particularly wintergreens. It is also produced synthetically, used as a fragrance, in foods and beverages, and in liniments.
In cold region during winter ______ freezes at room temperature itself and looks ice.
Report Question
0%
Palmitic acid
0%
Linoleic acid
0%
Oleic acid
0%
Ethanoic acid
Explanation
Ethanoic Acid
freezes during
winters
and forms a glacier like appearance; therefore it is also sometimes referred to as glacial
acetic acid
and is a very common laboratory chemical.
The IUPAC name of the given compound is:
Report Question
0%
4-pentanone
0%
Pentanone-2
0%
Pentan-2-one
0%
none of the above
Explanation
The correct IUPAC name is 2- Pentanone or Pentan-2-one. The parent hydrocarbon contains 5
C
atoms.
Hence the given compound is derivative of pentane. The second carbon atom has carbonyl group. Hence,
e
from pentane is replaced with
o
n
e
to obtain pentanone.
The position of carbonyl group is represented by number 2.
Option C is correct.
Functional group in saturated carboxylic acid is
:
Report Question
0%
−
C
O
O
H
0%
−
C
H
O
0%
−
O
H
0%
−
S
O
3
H
Explanation
Carboxylic acid: R- COOH
functional group is: -COOH
Hence, the correct option is
A
C
H
3
C
H
2
C
l
a
q
.
K
O
H
→
X
K
2
C
r
2
O
7
/
H
+
→
Y
Which of the following represents Y?
Report Question
0%
Ethylene
0%
Acetic acid
0%
Acetylene
0%
Acetone
Explanation
C
2
H
5
C
l
a
q
.
K
O
H
→
C
2
H
5
−
O
H
K
2
C
r
2
O
7
,
H
+
→
C
H
3
C
O
O
H
X
: Ethanol
Y
: Acetic acid
C
6
H
5
C
O
N
H
2
H
3
O
+
→
Δ
A
+
N
H
3
In this reaction,
A
is ___________.
Report Question
0%
C
6
H
6
0%
C
6
H
5
C
O
O
H
0%
C
6
H
5
N
H
2
0%
C
6
H
5
C
N
Explanation
When benzamide is hydrolyzed, it produces benzoic acid and ammonia.
The reaction is:
C
6
H
5
C
O
N
H
2
H
3
O
+
→
Δ
C
6
H
5
C
O
O
H
+
N
H
3
.
Report Question
0%
oxidation, chlorination
0%
reduction, chlorination
0%
oxidation, addition
0%
reduction, substtution
Explanation
The first step is oxidation with suitable oxidising agent
(
C
r
O
2
C
l
2
/
C
S
2
)
that will convert alcohol to aldehyde.
Second step is chlorination that will substitute the hydrogen of aldehyde in the presence of
(
C
l
2
/
h
v
)
.
General formula of saturated monocarboxylic acid is
:
Report Question
0%
C
n
H
2
n
+
1
C
O
O
H
0%
C
n
H
2
n
O
2
0%
Both A and B
0%
None of the above
Explanation
Monocarboxylic acids are in the form of
R
C
O
O
H
.
Let's take examples,
For R is
−
H
or
−
C
H
3
,
a)
H
C
O
O
H
→
C
1
H
2
O
2
which is following
C
n
H
2
n
O
2
trend.
b)
C
H
3
C
O
O
H
→
C
2
H
4
O
2
which is also following
C
n
H
2
n
O
2
trend.
When R is other than
−
H
or
−
C
H
3
group,
a)
C
2
H
5
C
O
O
H
→
C
3
H
6
O
2
which is following
C
n
H
2
n
+
1
C
O
O
H
trend.
So, the general formula is both A & B, i.e.,
C
n
H
2
n
O
2
and
C
n
H
2
n
+
1
C
O
O
H
.
Hence, both options A and B are correct.
Option C is correct.
Methyl cyanide on hydrolysis gives :
Report Question
0%
acetic acid.
0%
acetaldehyde.
0%
acetone.
0%
methyl amine.
Explanation
Methyl cynide on hydrolysis gives Acetic Acid.
Hence option A is correct.
C
H
3
C
H
2
O
H
+
O
2
X
→
Vinegar
In the above reaction,
X
is:
Report Question
0%
(
C
H
3
C
O
O
)
2
M
n
0%
C
H
3
C
O
O
H
0%
mycoderma aceti
0%
K
2
C
r
2
O
7
/
H
⨁
A compound of general formula
C
n
H
2
n
O
2
could
be
:
Report Question
0%
an acid
0%
a diketone
0%
an ether
0%
an aldehyde
Explanation
Formula i
C
n
H
2
n
O
2
(H is double of C)
i)
a
c
i
d
:
C
H
3
C
O
O
H
⋅
C
n
H
2
n
O
2
diketane:
ether:
C
H
3
O
C
H
3
⋅
s
i
n
g
l
e
o
x
y
g
e
n
aldehyde :
C
H
3
C
H
O
⋅
s
i
n
g
l
e
o
x
y
g
e
n
0:0:1
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