Aldehydes Ketones and Carboxylic Acids Test

Result

Aldehydes Ketones and Carboxylic Acids Test - 13

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

In the presence of $$H_2SO$$ concentrated sulphuric acid, acetic acid reacts with ethyl alcohol to produce :

A
Aldehyde

B
Alcohol

C
Ester

D
Carboxylic acid

Solution

$$CH_3COOH+C_2H_5OH\xrightarrow {CONC.H_2SO_4} CH_3COOC_2H_5+H_2O$$
(ester)
This reaction is known as esterification.
Question 2
1 / -0

The carbonyl carbon is:

A
electrophilic

B
nucleophilic

C
amphoteric

D
lewis base

Solution

The carbon-oxygen double bond is polarised due to higher electronegativity of oxygen relative to carbon. Hence, the carbonyl carbon is an electrophilic (lewis acid) and carbonyl oxygen is, a nucleophilic (lewis base) centre.
Question 3
1 / -0

Number of intramolecular aldol condensation product is:

A
1

B
2

C
3

D
4

Solution

The number of intramolecular aldol condensation product is equal to the number of $$\alpha$$ hydrogen present in the molecule. In the given molecule, there are three alpha hydrogen present at C-1, C-3 and C-6 respectively.
Question 4
1 / -0

Which of the following substituted carboxylic acids has the highest $$K_a$$ value?

A

B

C

D

Solution

-IE groups increases $$K_{a}$$ value of carboxylic acids. Here, -IE group is $$Cl^{-}$$ as distance matters in inductive effect. Here, $$Cl^{-}$$ is present in $$\alpha$$-carbon. Hence shows more $$K_{a}$$ value.
Question 5
1 / -0

The IUPAC name of ethyl isopropyl ketone is?

A
4-methyl-3-pentanone

B
1,1-dimethyl-2-butanone

C
2-methyl-3-pentanone

D
4,4-dimethyl-3-butanone

Solution

The IUPAC name of ethyl isopropyl ketone is 2-methyl-3-pentanone.
Hence, option C is correct.
Question 6
1 / -0

Which of the following is/are more reactive towards nucleophilic addition reactions?

A
$$CH_3COCH_3$$

B
$$HCHO$$

C
$$CH_3CHO$$

D
$$C_2H_5CHO$$

Solution

Propan-2-one contains two methyl groups and hence the positive inductive effect in this case is much higher leading to stabilization of the positive carbocation formed as an intermediate
Question 7
1 / -0

Lower aldehyde and ketones attributed to the formation of ______bonding with water molecules.

A
Sigma bonding

B
pii bonding

C
Covalent bonding

D
Hydrogen bonding

Solution

Lower members of aldehydes and ketones are misible with water because they form hydrogen bonds with water. The carbonyl carbon is electrophillic (lewis acid) and carbonyl oxygen is nuceophillic (lewis base). The dipole movement of carbonyl compounds is due to the highly polar character of the carbonyl group.
Question 8
1 / -0

Ketones reacts with Mg - Hg over water and give:

A
Alcohols

B
pinacolones

C
pinacols

D
none of these

Solution

Ketones reacts with Mg-Hg over water gives pinacols.
Hence, option C is correct.
Question 9
1 / -0

Which has a smell of oil of winter green?

A
Ethyl salicylate

B
Methyl salicylate

C
Benzaldehyde

D
Phenyl salicylate

Solution

Methyl salicylate (oil of wintergreen or wintergreen oil) is an organic compound with the formula $$C_6H_4(OH)(CO_2CH_3).$$ It is produced by many species of plants, particularly wintergreens. It is also produced synthetically, used as a fragrance, in foods and beverages, and in liniments.
Question 10
1 / -0

In cold region during winter ______ freezes at room temperature itself and looks ice.

A
Palmitic acid

B
Linoleic acid

C
Oleic acid

D
Ethanoic acid

Solution

Ethanoic Acid freezes during winters and forms a glacier like appearance; therefore it is also sometimes referred to as glacial acetic acid and is a very common laboratory chemical.