Aldehydes Ketones and Carboxylic Acids Test

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Aldehydes Ketones and Carboxylic Acids Test - 71

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Weekly Quiz Competition

Question 1
1 / -0

Monocarboxylic acids (saturated) are regarded as _____ oxidation products of paraffins.

A
first

B
second

C
third

D
fourth

Solution

Monocarboxylic acids (saturated) are regarded as $$\textbf {third}$$ oxidation products of paraffins.
Question 2
1 / -0

Which of the following reduces carboxylic acid directly to primary alcohols?

A
$$LiAl{H}_{4}$$

B
$$Na+{C}_{2}{H}_{5}OH$$

C
$$Na{BH}_{4}$$

D
$${H}_{2}$$

Solution
Question 3
1 / -0

The IUPAC name of caproic acid is:

A
pentanoic acid

B
hexanoic acid

C
heptanoic acid

D
octanoic acid

Solution

$$\textbf {Hexanoic acid}$$, also known as caproic acid, is the carboxylic acid derived from hexane with the chemical formula $$CH_3(CH_2)_4COOH.$$
Hence option (B) is correct.
Question 4
1 / -0

Some carboxylic acids and their IUPAC names are given below. Which of the following is not correctly matched?

A
Formic acid - Methanoic acid

B
Acetic acid - Ethanoic acid

C
Iso-butyric acid - 2 - Methyl butanoic acid

D
Malonic acid - Propandioic acid

Solution

Isobutyric acid is $$(CH_3)_2CHCOOH$$.
2 - Methyl butanoic acid is $$CH_3-CH_2-CH(CH_3)-COOH$$
hence option (C) is the answer.
Question 5
1 / -0

Arrange the following compounds in increasing order of their reactivity in nucleophilic addition reactions:
Ethanal (I), Propanal (II), Propanone (III), Butanone (IV)

A
$$I>III>IV>II$$

B
$$I>II>III>IV$$

C
$$III>II>I>IV$$

D
$$II>IV>III>I$$

Solution
Question 6
1 / -0

$$ (CH_3)_2CO \xrightarrow [HCl]{NaCN}(A) \xrightarrow [ \triangle]{H_3O^+ } (B) $$are :

A
$$ (CH_3)_2C(OH)CN, (CH_3 )_2C(OH)COOH $$

B
$$ (CH_3)_2C(OH)CN, (CH_3)_2C(OH)_2 $$

C
$$ (CH_3)_2C(OH)CN, (CH_3)_2CHCOOH $$

D
$$ (CH_3)_2C(OH)CN, (CH_3)_2CO $$

Solution
Question 7
1 / -0

Which of the following is the strongest acid?

A
$$HCOOH$$ ($$p{K}_{a}3.77$$)

B
$${C}_{6}{H}_{5}COOH$$ ($$p{K}_{a}4.22$$)

C
$${CH}_{3}COOH$$($$p{K}_{a}4.71$$)

D
$${CH}_{3}{CH}_{2}COOH$$ $$(p{K}_{a}4.88$$)

Solution
Question 8
1 / -0

In the given reaction, product $$P$$ is:

A

B

C

D

Solution

$$RMgX(Grignard's \;Reagent) + CO_2/H^+ \rightarrow RCOOH$$

Hence (P) is $$C_6H_5-COOH$$
Hence option (B) is correct.
Question 9
1 / -0

Propionic acid with $${Br}_{2}/P$$ yields a dibromaproduct. Its structure would be:

A
$${CH}_{2}Br{CH}_{2}COBr$$

B
$${CH}_{2}BrCHBrCOOH$$

C
$$CH{Br}_{2}{CH}_{2}COOH$$

D
$${CH}_{3}C{Br}_{2}COOH$$

Solution

$$\underset {Propionic\; acid}{CH_3−CH_2−COOH}$$ $$\xrightarrow {Br_2/P} {CH_3−C(Br)_2−COOH}$$

Carbonylic acids reacts with $$Cl_2$$ or $$Br_2$$ in presence of red $$P$$ to give exclusively α-chloro or α -bromo acids. This reaction is called Hell-Volhard-Zelinsky (HVZ) reduction . This reaction is example of α H-substitution.
Hence option (D) is correct.
Question 10
1 / -0

Which of the following gives smell of burnt sugar on charring?

A
Oxalic acid

B
Tartaric acid

C
Malonic acid

D
Succinic acid

Solution

Tartaric acid on charring gives the smell of burning sugar.
Hence, Option "B" is the correct answer.