Aldehydes Ketones and Carboxylic Acids Test

Result

Aldehydes Ketones and Carboxylic Acids Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following acids is hydroxy acid?

A
Maleic acid

B
Succinic acid

C
Lactic acid

D
Adipic acid

Solution

Lactic acid is a hydroxy acid because it contains both groups ie,$$-OH$$ and $$-COOH$$ groups
Question 2
1 / -0

The solubility of water decreases rapidly with the increase in the size of ------------ groups attached to carbonyl group.

A
alkyl

B
aryl

C
phenyl

D
benzyl

Solution

As the size of the Alkyl group increases the solubility decreases rapidly due to increase in the magnitude of a non-polar part in the molecule. Lower members of aldehydes and ketones are miscible with water because they form hydrogen bonds with water. But both aldehydes and ketones are freely soluble in organic solvents.
Question 3
1 / -0

A student takes 2 mL acetic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He makes the following observations:
I. A colourless and odourless gas evolves with a brisk effervescence.
II. The gas turns lime water milky when passed through it.
III. The gas burns with an explosion when a burning splinter is brought near it.
IV. The gas extinguishes the burning splinter that is brought near it.
The correct observations are:

A
I, II, and III

B
II, III and IV

C
III, IV and I

D
IV, I and II

Solution

When acetic acid reacts with sodium hydrogen carbonate, $$CO_2$$ gas is released. The gas is odorless and colorless and evolves with brisk effervescence.
$$CO_2$$ turns lime water milky when passed through it due to the formation of calcium carbonate.
The burning splinter extinguishes when the gas is brought near it as it does not support combustion and is not flammable.

I, II, and IV observations are correct. Option D is correct.
Question 4
1 / -0

What is the product of the following reaction?

A

B

C

D

Solution

$$CrO_3 / H_2SO_4$$ oxidises aldehyde to carboxylic acid.
Question 5
1 / -0

Find structure which has an organic acid functional group :

A
$$\displaystyle { CH }_{ 3 }-{ CH }_{ 2 }-{ CH }_{ 3 }$$

B
$$\displaystyle CH_3-\underset {\displaystyle \underset {\displaystyle O}{ ||}}{C}-OH$$

C
$$\displaystyle { CH }_{ 3 }-O-{ C }_{ 3 }{ H }_{ 7 }$$

D
$$\displaystyle { CH }_{ 3 }-\overset { \overset { O }{ \parallel } }{ C } -{ CH }_{ 3 }$$

E
$$CH_3 - CH_2 - NH_2$$

Solution

Acetic acid $$\displaystyle CH_3-\underset {\displaystyle \underset {\displaystyle O}{ ||}}{C}-OH$$ has an organic acid functional group.

It is also called ethanoic acid. It can be considered as a compound formed by substituting the hydrogen atom of methane by the carboxylic group ($$-COOH$$).

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

Polarity of carbonyl group increase with increase of ________.

A
electronegative groups

B
electropositive groups

C
neutral group

D
none of these

Solution

As carbon is electropositive atom polarity increases with electronegative groups.
Question 7
1 / -0

The IUPAC name of the formic acid:

A
methanoic acid

B
ethanoic acid

C
propanoic acid

D
butanoic acid

Solution

Formic Acid is $$HCOOH$$
IUPAC name is methanoic acid
Question 8
1 / -0

Aldehydes and ketones with ______ or more carbon atoms are either sparingly soluble or insoluble in water.

A
5

B
6

C
7

D
8

Solution

Aldehydes and ketones more than $$C-5$$ are soluble in benzene, ether etc.

Lower aldehydes and ketones are soluble in water.

Higher aldehydes and ketones the solubility in water decreases rapidly due to hydrogen bonding.

Hence the correct option is A.
Question 9
1 / -0

The organic acid that can be made from ethanol is:

A
acetic acid

B
formic acid

C
$$C_{3}H_{7}OH$$

D
valeric acid

E
butanoic acid

Solution

The organic acid that can be made from ethanol is acetic acid, in the image above.
Question 10
1 / -0

The general formula of carboxylic acids is:

A
$$C_nH_nCOOH$$

B
$$C_nH_{2n-1}$$

C
$$C_nH_{2n-2}COOH$$

D
$$C_nH_{2n+1}COOH$$

Solution

The general formula of carboxylic acid is $${ C }_{ n }{ H }_{ 2n+1 }COOH$$
$$C{ H }_{ 3 }COOH, { C }_{ 2 }{ H }_{ 5 }COOH$$...etc