Aldehydes Ketones and Carboxylic Acids Test

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Aldehydes Ketones and Carboxylic Acids Test - 31

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Weekly Quiz Competition

Question 1
1 / -0

$$A\xrightarrow [ ]{ HCN } B\xrightarrow [ ]{ { H }_{ 3 }{ O }^{ + } } Lactic \ acid$$
Identify $$A$$.

A
$$HCHO$$

B
$${ CH }_{ 3 }CHO$$

C
$${ C }_{ 6 }{ H }_{ 5 }CHO$$

D
$${ CH }_{ 3 }CO{ CH }_{ 3 }$$

Solution

answer is (b)
Question 2
1 / -0

State the oxidation number of carbonyl carbon in methanal and methanoic acid respectively:

A
$$0$$ and $$0$$

B
$$0$$ and $$+2$$

C
$$+1$$ and $$+2$$

D
$$+1$$ and $$+3$$

Solution

Let the oxidation number of carbonyl carbon in methanal $$(HCHO)$$ and methanoic acid $$(HCOOH)$$ is $$x$$ and $$y$$ .respectively
In $$HCHO$$,
$$2(+1)+x+(-2)=0$$
$$2+x-2=0$$
$$x=0$$
In $$HCOOH$$
$$2(+1)+y+2(-2)=0$$
$$y=2$$
Question 3
1 / -0

IUPAC name of the above compound is:

A
bicyclo[3,2,1]-octan-2-oic acid

B
bicyclo-[3,2,1]-octane-8-carboxylic acid

C
bicyclo-[3,2,1]-octan-8-oic acid

D
none of these

Solution

The IUPAC Name is
bicyclo-[3,2,1]-octane-8-carboxylic acid
Question 4
1 / -0

The main product obtained in the reaction of acetamide and $$H{NO}_{2}$$ is:

A
$${ CH }_{ 3 }CN$$

B
$${ CH }_{ 3 }NC$$

C
$${ CH }_{ 3 }{ NH }_{ 2 }$$

D
$${ CH }_{ 3 }COOH$$

Solution

$$\underset{acetamide }{{ CH }_{ 3 }-{ CH }_{ 2 }-{ NH }_{ 2 }}+H{ NO }_{ 2 }\longrightarrow { CH }_{ 3 }COOH+{ H }_{ 2 }O+{ N }_{ 2 }\uparrow $$

Option D is correct.
Question 5
1 / -0

Which of the following statements is not true for acetaldehyde ?

A
It will undergo an aldol condensation reaction.

B
It will undergo a Cannizzaro reaction.

C
It will undergo a haloform reaction

D
Enolisation is catalysed by acid or base.

Solution

Acetaldehyde contains $$\alpha-H$$, so it undergoes aldol condensation rather than Cannizzaro reaction.

It undergoes the haloform reaction as it contains $$-COCH_3$$ group.

As it contains the alpha hydrogen it undergoes enolisation.
Question 6
1 / -0

What is the oxidation number of carbonyl carbon in acetophenone?

A
$$+3$$

B
$$+1$$

C
$$+2$$

D
Zero

Solution

Thus, oxidation number of carbonyl carbon in acetophenone is $$+2$$. It is attach to two C atom of same EN and 1 O atom which has higher EN value via double bond.
Question 7
1 / -0

When a nucelophile encounters a ketone the site of attack is:

A
The carbon atom of the carbonyl

B
The oxygen atom of the carbonyl

C
Both the carbon and oxygen atoms with equal probability

D
No attack occurs-ketones do not react with nucleophiles

Solution

Nucleophile attacks on the carbon atom of the carbonyl group as shown in the figure.
Question 8
1 / -0

What is the structural formula of fumaric acid?

A

B

C

D

Solution

The structural formula of fumaric acid is:
Question 9
1 / -0

Artificial sweetening agent is prepared from the strategy. Identify the structure of final product.

A

B

C

D

Solution

Artificial sweetening agent is prepared from the strategy. The structure of final product is represented by option (A). The final product is saccharine. It goes directly through the human digestive system without being digested. It is 550 times more sweet than cane sugar.
Question 10
1 / -0

Consider the following sequence of reactions.
The products $$(A)$$ and (B) are:

A

B

C

D

Solution

Ketone gives hydroxylamine products on reaction with Hydroxylamine and heating/oxime.