Aldehydes Ketones and Carboxylic Acids Test

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Aldehydes Ketones and Carboxylic Acids Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

Pyruvic acid is obtained by:

A
oxidation of acetaldehyde cyanohydrin

B
oxidation of formaldehyde cyanohydrin

C
oxidation of acetone cyanohydrin

D
None of the above

Solution

Acetaldehyde with HCN gives acetaldehyde cyanohydrin
$$C{ H }_{ 3 }CHO+HCN\longrightarrow C{ H }_{ 3 }CH(CN)-OH$$

on oxidation it gives,
$$C{ H }_{ 3 }CH(CN)-OH\longrightarrow { CH }_{ 3 }CH(OH)-COOH$$

$$\\ \\ { CH }_{ 3 }CH(OH)-COOH\longrightarrow C{ H }_{ 3 }C(COOH)=O$$
gives pyruvic acid.
Question 2
1 / -0

(i) $$F_3C-COOH$$
(ii) $$CH_3COOH$$
(iii) $$C_6H_5COOH$$
(iv) $$CH_3CH_2COOH$$
Correct order of $$pK_a$$ value is?

A
$$1 > 3 > 2 > 4$$

B
$$4 > 2 > 3 > 1$$

C
$$4 > 3 > 2 > 1$$

D
$$1 > 2 > 4 > 3$$

Solution

Solution:- (B) $$4 > 2 > 3 > 1$$
As we know that stronger the acid, lower the value of p{K}_{a}$$.
Hence the correct order of $$p{K}_{a}$$ value is-
$$4 > 2 > 3 > 1$$
Question 3
1 / -0

Which of the following is IUPAC name of compound?

A
1, 4-dichloro-2, 6-dioxo-4-carboxyl-1-oic acid

B
2, 4-dioxo-1, 4-dichlorohexane-1-carboxylic acid

C
1, 4-dichloro-2, 4, 6-dioxoxyxlohexane-1-carboxylic acid

D
1, 4-dichloro-4-formyl-2, 6-dioxo cyclohexane-1-carboxylic acid

Solution
Question 4
1 / -0

Functional group in saturated carboxylic acid is:

A
$$-COOH$$

B
$$-CHO$$

C
$$-OH$$

D
$$-SO_{3}H$$

Solution

Carboxylic acid: R- COOH
functional group is: -COOH

Hence, the correct option is $$\text{A}$$
Question 5
1 / -0

Which of the following is the functional group for carboxylic acids?

A

B

C
-OH

D

Solution
Question 6
1 / -0

What is the common name of propanone?

A
Oxobutane

B
Acetone

C
Ethyl acetone

D
Ethyl methyl ketone

Solution

The IUPAC name of $$CH_{3}COCH_{3}$$ is propanone and the common name is acetone.
Question 7
1 / -0

Ethanoic acid is obtained by the ..... of ethanol.

A
Combustion

B
Oxidation

C
Reduction

D
Subsitution

Solution

Alcohols get oxidised to carboxylic acids with the help of alkaline $$KMnO_4$$ or acidified $$K_2Cr_2O_7$$.

$$C_2H_5OH\frac {Alk.\ KMnO_4}{\text {or Acidic} \ K_2Cr_2O_7}CH_3COOH$$

Ethanoic acid is obtained by the oxidation of ethanol.
Question 8
1 / -0

$$HCHO\xrightarrow [ ]{ Reduction } A\xrightarrow [ ]{ P\quad and\quad { I }_{ 2 } } B\xrightarrow [ ]{ KCN } C\xrightarrow [ ]{ Hydrolysis } D$$
What is $$D$$?

A
Acetic acid

B
Ethylamine

C
Acetamide

D
None of these

Solution

$$\underset { methanal }{ HCHO } \xrightarrow [ ]{ Reduction } \underset { methanol\\ (A) }{ { CH }_{ 3 }OH } \xrightarrow [ ]{ P+{ I }_{ 2 } } \underset { methyl\quad iodide\\ (B) }{ { CH }_{ 3 }I } \xrightarrow [ ]{ KCN } \underset { methyl\quad cyanide\\ (C) }{ { CH }_{ 3 }CN } \xrightarrow [ ]{ Hydrolysis } \underset { acetic\quad acid\\ (D) }{ { CH }_{ 3 }COOH } $$
Question 9
1 / -0

Oxidation product of X with molecular formula $$C_{2}H_{4}O$$ is Y with molecular formula $$C_{2}H_{4}O_{2}$$.The compound Y is :

A
acetic acid

B
formic acid

C
propionic acid

D
buteric acid

Solution

A
X:- Ethanal
Y:- Ethanoic acid
Question 10
1 / -0

Which of the following is the functional group for carboxylic acids?

A

B

C

D

Solution

The carboxyl functional group that caracterizes the carboxylic acid is unusual in that it is composed of two functional group : (1) the carboxyl group and (2) of a hydroxyl group bonded to a carbonyl group . It is often written in condensed form as $$–CO_2H$$ or $$–COOH$$.