Aldehydes Ketones and Carboxylic Acids Test

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Aldehydes Ketones and Carboxylic Acids Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following cannot form $$CH_{3}COOH$$ from $$C_{2}H_{5}OH$$?
A) PCC
B) PDC
C) $$K_{2}Cr_{2}O_{7} / H^{+}$$
D)$$KMnO4/ H^+$$

A
A and B only

B
C and D only

C
Only A

D
All A, B, C and D

Solution

PCC and PDC are the mild oxidizing agent.

They oxidize ethanol to ethanol, not ethanoic acid.

While the $$KMnO_4$$ and $$K_2Cr_2O_7$$ are strong oxidizing agents, hence, they convert ethanol into acetic acid.

Option A is correct.
Question 2
1 / -0

$$C_{6}H_{5}CONH_{2} \xrightarrow[\Delta]{H_{3}O^+} A + NH_{3}$$
In this reaction, $$A$$ is ___________.

A
$$C_{6}H_{6}$$

B
$$C_{6}H_{5}COOH$$

C
$$C_{6}H_{5}NH_{2}$$

D
$$C_{6}H_{5}CN$$

Solution

When benzamide is hydrolyzed, it produces benzoic acid and ammonia.
The reaction is:
$$C_{6}H_{5}CONH_{2} \xrightarrow[\Delta]{H_{3}O^+} C_6H_5COOH + NH_{3}$$
Question 3
1 / -0

$$CH_{3}OH \xrightarrow[(ii)\: Rh, \: \Delta]{(i)\: X} CH_{3}COOH$$
In the above reaction, $$X$$ is :

A
$$CO_{2}$$

B
$$CO$$

C
$$MgO$$

D
$$C$$

Solution

The compound $$X$$ is $$CO$$.
The reaction is as follows:
$$CH_{3}OH \xrightarrow[(ii)\: Rh, \: \Delta]{(i)\:{CO}} CH_{3}COOH$$
The reaction of $$CO$$ with methanol, followed by heating with $$Rh$$ gives acetic acid. This process is called as Monsanto process.
Question 4
1 / -0

Which of the following is the strongest acid?

A
$$HCOOH\ (pK_{a}=3.77)$$

B
$$C_{6}H_{5}COOH\ (pK_{a}=4.22)$$

C
$$CH_{3}COOH\ (pK_{a}=4.71)$$

D
$$CH_{3}CH_{2}COOH\ (pK_{a}=4.88)$$

Solution

Lower the pKa value, higher is the acid dissociation constant and so, higher is the acidic strength.

Hence, option A with least $$pK_a$$ value is the correct answer.

Option A is correct.
Question 5
1 / -0

Methyl cyanide on hydrolysis gives :

A
acetic acid.

B
acetaldehyde.

C
acetone.

D
methyl amine.

Solution

Methyl cynide on hydrolysis gives Acetic Acid.

Hence option A is correct.
Question 6
1 / -0

$$CH_{3}CH_{2}OH+O_{2}\xrightarrow[]{X}$$ Vinegar
In the above reaction, $$X$$ is:

A
$$(CH_{3}COO)_{2}Mn$$

B
$$CH_{3}COOH$$

C
mycoderma aceti

D
$$K_{2}Cr_{2}O_{7}/H^{\bigoplus}$$
Question 7
1 / -0

Which of the following is not a monovalent group?

A
Aldehydic

B
Ketonic

C
Carboxylic

D
Hydroxy

Solution

Valency is the number of chemical bonds formed by the functional group. Aldehyde, carboxylic acid and hydroxy groups form one chemical bond, whereas ketone can form two chemical bonds. Therefore, ketonic group is not monovalent.

$$R-CO-R$$ is ketone functional group, which is bivalent.
Question 8
1 / -0

Isobutyraldehyde on oxidation gives:

A
2-Methylpropanoic acid

B
2-Methylpropanone

C
Propanoic acid

D
2-Methyl butanoic acid

Solution

The aldehydes gets oxidised to carboxylic acid.
Question 9
1 / -0

An aldehyde on oxidation gives

A
an acid

B
an alcohol

C
an ether

D
a ketone

Solution

Alcohols on oxidation give aldehydes while aldehydes on further oxidation give carboxylic acids.
Question 10
1 / -0

List-A
List-B
Aldehyde
Oxidised product of
Aldehyde
1. Formaldehyde
A. Acetic Acid
2. Acetaldehyde
B. Propanoic acid
3. Propionaldehyde
C. Isobutyric acid
4. Isobutyraldehyde
D. Methanoic acid

Match the contents in List-A to that in List-B.

A
1-D, 2-A, 3-B, 4-C

B
1-A, 2-D, 3-C, 4-B

C
1-A, 2-C, 3-D, 4-B

D
1-D, 2-B, 3-C, 4-A

Solution

Formaldehyde $$(HCHO)$$ on oxidation gives methanoic acid $$(HCOOH)$$.

Acetaldehyde $$(CH_3CHO)$$ on oxidation gives acetic acid $$(CH_3COOH)$$.

Propionaldehyde $$(CH_3CH_2CHO)$$ on oxidation gives propanoic acid $$(CH_3CH_2COOH)$$.

Isobutyraldehyde $$(CH_3CH(CH_3)CHO)$$ on oxidation gives isobutyric acid $$((CH_3CH(CH_3)COOH)$$.

Option A is correct.

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List-A	List-B
Aldehyde	Oxidised product of Aldehyde
1. Formaldehyde	A. Acetic Acid
2. Acetaldehyde	B. Propanoic acid
3. Propionaldehyde	C. Isobutyric acid
4. Isobutyraldehyde	D. Methanoic acid

Aldehydes Ketones and Carboxylic Acids Test - 15

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Aldehydes Ketones and Carboxylic Acids Test - 15

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Question 1

A and B only

C and D only

Only A

All A, B, C and D

Solution

Question 2

$$C_{6}H_{6}$$

$$C_{6}H_{5}COOH$$

$$C_{6}H_{5}NH_{2}$$

$$C_{6}H_{5}CN$$

Solution

Question 3

$$CO_{2}$$

$$CO$$

$$MgO$$

$$C$$

Solution

Question 4

$$HCOOH\ (pK_{a}=3.77)$$

$$C_{6}H_{5}COOH\ (pK_{a}=4.22)$$

$$CH_{3}COOH\ (pK_{a}=4.71)$$

$$CH_{3}CH_{2}COOH\ (pK_{a}=4.88)$$

Solution

Question 5

acetic acid.

acetaldehyde.

acetone.

methyl amine.

Solution

Question 6

$$(CH_{3}COO)_{2}Mn$$

$$CH_{3}COOH$$

mycoderma aceti

$$K_{2}Cr_{2}O_{7}/H^{\bigoplus}$$

Question 7

Aldehydic

Ketonic

Carboxylic

Hydroxy

Solution

Question 8

2-Methylpropanoic acid

2-Methylpropanone

Propanoic acid

2-Methyl butanoic acid

Solution

Question 9

an acid

an alcohol

an ether

a ketone

Solution

Question 10

1-D, 2-A, 3-B, 4-C

1-A, 2-D, 3-C, 4-B

1-A, 2-C, 3-D, 4-B

1-D, 2-B, 3-C, 4-A

Solution

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