Aldehydes Ketones and Carboxylic Acids Test

Result

Aldehydes Ketones and Carboxylic Acids Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

The product (B) is:

A
Benzaldehyde

B
Benzoic acid

C
Phenylacetic acid

D
None of the above

Solution

$$KMnO_4$$ is the strong oxidizing agent. It oxidized the side chain to -COOH group. The compound formed B is benzoic acid.

Option (B) is correct.
Question 2
1 / -0

Which of following is compound (A) if (G) is 2-oxo-butan-1-al?

A
Ethane

B
Ethene

C
Ethyne

D
Butyne

Solution
Question 3
1 / -0

Which of the following cannot be used as reagent (B) ?

A
$$CH_3O\ominus$$ at high temperature

B
$$C_2H_5O^\ominus$$ at high temperature

C

D
$$CsOH + C_2H_5OH$$

Solution

Tert butoxide ion $$\displaystyle ((CH_3)_3-CO^-)$$ at high temperature cannot be used as reagent (B). It is bulky base and will give Hoffmann product (less substituted alkene).
Saytzeff product (more substituted alkene) is obtained by reagent a, b, d (les-bulky base).
Question 4
1 / -0

Give the products formed on reductive ozonolysis with LAH and oxidative ozonolysis with $$H_2O_2$$, from the compounds.

A
Propan-1,3-diol and propan-1,3-dioic acid

B
Propan-1,2-diol and propan-1,3-dioic acid

C
Propan-1,3-diol and propan-1,2-dioic acid

D
Propan-1,2-diol and propan-1,2-dioic acid

Solution

In reductive ozonolysis with $$LAH$$ or $$NaBH_4$$ aldehyde and ketone are converted into alcohol and in oxidative ozonolysis with $$H_2O_2$$, the ketone remains unchanged and converts aldehyde to acid.
Question 5
1 / -0

In the following sequence of reactions, products (A) to (H) are formed. Then the Compound (G) is :

A

B

C

D

Solution

Compound (G) is represented by the option (A).

The compound (G) is cyclo-octa-1,3,5-triene. It is obtained from compound (F) (cyclo-octa-2-yn-1,4-diol). The reagents used are

(i) conc. $$\displaystyle H_2SO_4$$
two molecules of water are eliminated to form two $$\displaystyle C=C$$ double bonds.

(ii) $$\displaystyle H_2 +$$ Lindlar's catalyst.
$$\displaystyle C \equiv C$$ triple bond is reduced to $$\displaystyle C=C$$ double bond.
Question 6
1 / -0

In the reaction
The product (A) is :

A

B

C

D

Solution

In the reaction, product (A) is represented by the option (C).
Alpha beta unsaturated carbonyl compounds react with lithium dialkyl cuprate. This is an example of 1,4- addition or conjugate addition reaction. A $$C-C$$ bond is formed in this reaction.
Question 7
1 / -0

Cumene on treatment with $${KMnO_4}$$ gives:-

A
A

B
B

C
C

D
D

Solution

Cumene on treatment with KMnO4 gives benzoic acid. The side chain of benzene is oxidized to -COOH group.

Option B is correct.
Question 8
1 / -0

3-Methyl-2-pentanone is :

A

B

C

D

Solution

In 3-methyl-2-pentanone,
a. one methyl group at C3
b.one keto group at C2 and
c. 5 carbons in the carbon long chain.
According to the IUPAC nomenclature, carbonyl or keto group has higher priority than any alkyl group. So nomenclature should be done in such a way that keto group possess minimum numbering. So the correct option is A
Question 9
1 / -0

Cynohydrin of which of the following compound can give lactic acid

A
$$HCHO$$

B
$$CH_{3}COCH_{3}$$

C
$$CH_{3}CHO$$

D
$$CH_{3}CH_{2}CHO$$

Solution

Cyanohydrin of acetaldehyde $$CH_3CHO$$ can give lactic acid.
Question 10
1 / -0

Acetylsalicylic acid is a pain killer and is commonly known as

A
paracetamol

B
aspirin

C
ibuprofen

D
penicillin

Solution

Acteyl salicylic acid is commonly known as aspirin.