Carboxylic Acids Test

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Carboxylic Acids Test - 2

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Weekly Quiz Competition

Question 1
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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 isnucleophilic 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 ‘C₃ H₆ O ’have?

A
6

B
4

C
5

D
11

Solution

The Isomers of C₃ H₆ O include:
Hence we can see that a total of 11 isomers of C₃ H₆ O are possible.
Question 3
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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 (CH ₃)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 )₂ CHCHO?

A
2,2-Dimethylpropanal

B
3-Hydroxypropanal

C
But-3-en-2-one

D
None of these

Solution

The IUPAC name of (CH₃ )₂ CHCHO 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 (CH₃ COCH₃ ) and Propanal (CH₃ CH₂ CHO) are functional isomers.
Acetone:
Propanal:
Question 7
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The IUPAC name of CH₃ CHO is:

A
Acetaldehyde

B
Ethanal

C
Formaldehyde

D
Methanal
Solution
The functional group is analdehyde ;−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
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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

Functional isomers

Explanation: Propanone (CH3COCH3) and prop-2-en-1-ol (CH2=CHCH2OH) are examples of functional isomers because they have the same molecular formula (C3H6O) but different functional groups. Propanone has a carbonyl group (C=O) while prop-2-en-1-ol has an alcohol group (OH) and a carbon-carbon double bond (C=C).