Aldehydes, Ketones and Carboxylic Acids Test 1

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Aldehydes, Ketones and Carboxylic Acids Test 1

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements are correct in case of the carbonyl bond between carbon and oxygen?

A
Carbon is the nucleophilic centre and Oxygen is the electrophilic centre.

B
Oxygen is the nucleophilic centre and Carbon is the electrophilic centre.

C
Both 'b' and 'd' are correct

D
Carbon and Oxygen double bond is polarised.

Solution

In carbonyl bonds b/w O and C, C is electrophilic centre(centre which needs electron as it is deficient in it) and O is nucleophilic centre(centre which needs +ve charge as it has excess charge). Also, C=O bond is polarised with O having partial negative charge and C having partial positive charge.
Question 2
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How many structural isomers can compound with molecular formula ‘C₃H₆O’ have?

A
6

B
4

C
5

D
11

Solution

The Isomers of C₃H₆O include:
Hence we can see that a total of 11 isomers of C₃H₆O are possible.
Question 3
1 / -0

What is the common name of 2-methyl-propanal?

A
formaldehyde

B
Isobutyraldehyde

C
carbaldehyde

D
acetaldehyde
Solution
Isobutyraldehyde is the chemical compound with the formula (CH₃)₂CHCHO.
It is an aldehyde, isomeric with n-butyraldehyde.
Isobutyraldehyde is manufactured, often as a side-product, by the hydroformylation of propene. Its odour is described as that of wet cereal or straw.
Question 4
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Write the IUPAC name of (CH₃)₂CHCHO?

A
2,2-Dimethylpropanal

B
3-Hydroxypropanal

C
But-3-en-2-one

D
None of these

Solution

The IUPAC name of (CH₃)₂CHCHO is 2-methylpropanal and its chemical name is Isobutyraldehyde.
Question 5
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Carbonyl compounds when oxidized easily to form carboxylic group involves

A
aldehydes

B
ketones

C
haloalkanes

D
esters

Solution

Alcohol is the group in which (carbonyl) group is not present. Aldehydes, ketones and carboxylic acids all have a carbonyl group present in them. Aldehydes have group, ketones have a group and carboxylic acids have a group.
Hence A is correct.
Question 6
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Acetone and Propanal are

A
Functional isomers

B
Position isomers

C
Geometrical isomers

D
Optical isomers
Solution
Acetone (CH₃COCH₃) and Propanal (CH₃CH₂CHO) are functional isomers.
Acetone:
Propanal:
Question 7
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The IUPAC name of CH₃CHO is:

A
Acetaldehyde

B
Ethanal

C
Formaldehyde

D
Methanal
Solution
The functional group is an aldehyde; −CHO and the given compound has two carbon atoms.
Thus, the IUPAC name of the compound is ethanal.
Question 8
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What is the IUPAC name of Acrolein?

A
pent-2-enal

B
but-1-enal

C
prop-2-enal

D
but-2-enal

Solution

IUPAC name of acrolein is prop-2-enal, a name derived from that of acrylic acid, the parent carboxylic acid.
Question 9
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Which of the following statement about C=O and C=C is correct?

A
Both consist of a sigma and pi bond

B
C=O is polar but C=C is non-polar

C
Both a and b are correct

D
Both C=O and C=C undergo nucleophilic addition reactions
Solution
The first bond formed is a sigma bind and the second one is a pi bond.
O has a higher electronegativity than C and hence the electron cloud will be shifted towards the O atom, making the compound polar.
This is not possible in C=C.
Question 10
1 / -0

Propanone and prop-2-en-1-ol are examples of which type of isomerism?

A
Functional isomers

B
Chain isomers

C
Tautomers

D
Position isomers
Solution
Propanone (a ketone) and, Prop-2-en-1-ol with molecular formula C3H6O (an aldehyde) exhibit functional isomerism.
Functional isomerism, an example of structural isomerism, occurs when substances have the same molecular formula but different functional groups.
This means that functional isomers belong to different homologous series.
Prop-2-en-1-ol:
Propanone: