Aldehydes Ketones and Carboxylic Acids Test

Result

Aldehydes Ketones and Carboxylic Acids Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

Functional group of carboxylic acid is:

A
$$RO-$$

B
$$-C-OH$$

C
$$-OH$$

D
$$ -COOH$$

Solution

The functional group of carboxylic acid is $$ R-COOH$$
where R is the Alkyl group and in nomenclature, they are named as -oic acids.
like carbonic acid, formic acid, Acetic acid etc..
Question 2
1 / -0

In the reaction $$C_6H_6\, \xrightarrow[AlCl_3]{CH_3Cl}\, A\, \xrightarrow{KMnO_4}\, B$$
$$B$$ is:

A
benzoic acid

B
benzoyl chloride

C
benzaldehyde

D
chlorobenzene

Solution

$${ C }_{ 6 }{ H }_{ 6 }\xrightarrow [ { CH }_{ 3 }Cl ]{ { AlCl }_{ 3 } } { C }_{ 6 }{ H }_{ 5 }{ CH }_{ 3 }\xrightarrow { { KMnO }_{ 4 } } { C }_{ 6 }{ H }_{ 5 }COOH$$

The first reaction is Friedel craft alkylation reaction and then oxidation of toluene to give benzoic acid.

So. option A is correct.
Question 3
1 / -0

The major product in the following at $$25^oC$$ is: $$CH_3COOH\xrightarrow {CH_3CH_2NH_2}$$

A
$$CH_3CONHCH_2CH_3$$

B
$$CH_3CH=NCH_2CH_3$$

C
$$NH_3^+CH_2^-CH_3.CH_2COO^-$$

D
$$CH_2CON=CHCH_3$$

Solution

At room temperature, it is a simple acid-base reaction resulting in the formation of salt.
Question 4
1 / -0

The order or reactivity of phenyl magnesium bromide with the following compounds is:
(I) $$CH_3-\overset{\displaystyle O}{\overset{\displaystyle ||}{C}}-CH_3$$
(II) $$H-\overset{\displaystyle O}{\overset{\displaystyle ||}{C}}-CH_3$$
(III) $$Ph-\overset{\displaystyle O}{\overset{\displaystyle ||}{C}}-Ph$$

A
(II)> (III) > (I)

B
(I) > (III)> (II)

C
(II) > (I) > (III)

D
all react with the same rate

Solution

This is nucleophilic addition reaction to carbonyl group as the Grignard reagent acts as nucleophile.

The carbon atom of $$C=O$$ group should be more electron defecient for faster attack of nucleophile.

Aldehydes have less electron-density than ketones, hence aldehydes are more reactive than ketones.

The steric hinderance also affect the reactivity, so the III is least reactive due to bulky phenyl rings which slows down the nucleophilic attack.

Option C is correct.
Question 5
1 / -0

Polarisation of electron in acrolein $$\left(C{H}_{2}=CH-CH=O\right)$$ or resonance hybrid of acrolein can be written as:

A

B

C

D

Solution

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

Aldehydes on oxidation gives_________

A
Alcohol

B
Acid

C
Ketone

D
Ether

Solution

Aldehydes on oxidation gives carboxylic acids. For example, oxidation of acetaldehyde gives acetic acid.
Question 7
1 / -0

Cyanohydrin of which of the following compound on hydrolysis gives optically active products?

A
$$HCHO$$

B
$$CH_{3}CHO$$

C
$$CH_{3}COCH_{3}$$

D
all of the above

Solution

Acetaldehyde cyanohydrin on hydrolysis gives an optically active acid.
Question 8
1 / -0

$$A$$ reacts with $$NaOI$$ followed by the reaction with $$H^+$$ to give $$3,\,4-$$dihydroxybenzoic acid. What is $$A$$ ?

A

B

C

D

Solution

The structure of compound (A) is represented by option (A). It undergoes haloform reaction to form 3,4−dihydroxybenzoic acid.
Question 9
1 / -0

In deodorant soaps, the additive added is:

A
glycerol

B
stearic acid

C
potassium bicarbonate

D
3,4,5-tribromo salicylaldehyde

Solution

3,4,5-Tribromo salicylaldehyde is an agent present in the deodorant soap to prevent the decomposition of perspiration into an odorous compound.
Question 10
1 / -0

Quinaine is obtained from-

A
Bark

B
Fruit

C
Leaves

D
Roots

Solution

Quinaine $$\displaystyle \left ( C_{20}H_{24}O_{2}N_{2} \right )$$ is obtained from the bark of Cinchona (Chinchona ledgeriana Linn.) tree by which quinic acid is made Its bark has 30% chemically related alkaloids