Aldehydes Ketones and Carboxylic Acids Test

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Aldehydes Ketones and Carboxylic Acids Test - 46

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Weekly Quiz Competition

Question 1
1 / -0

The IUPAC name for the above compound is

A
1-hydroxypentane-1,4-dione

B
1, 4-dioxopentanol

C
1-carboxybutan-3-one

D
4-oxopentanoic acid

Solution

If more than one functional groups are present in the chain, one will be the main functional group on priority basis and mentioned as a sec. suffix, while the others are written as prefix mentioned as oxo along with locant.
Question 2
1 / -0

The general formula for aldehydes is $$C_nH_{2n+1}CHO$$. The value of n for the first member.

A
$$1$$

B
$$0$$

C
$$0.5$$

D
$$1.1$$

Solution

The general formula of alkyl group is $$C_nH_{2n+1}CHO$$ and hence general formula for aldehyde will be $$C_nH_{2n+1}CHO$$ provided $$n = 0, 1, 2, 3,$$ etc.
thus, the value of n for the first member is 0 i.e $$HCHO$$
Question 3
1 / -0

An organic compound X has the molecular formula $$C_3H_6O_2$$. It has a pleasant smell but does not turn blue litmus red. It has a structural formula.

A

B

C
both (a) and (b)

D
None of the above

Solution

an organic compound that has the molecular formula $$C_3H_6O_2$$ and having pleasant smell but does not turn blue litmus red suggests that it must be an ester.
thus, the structural formula is..... ( refers image)
Question 4
1 / -0

The hybridization of carbonyl carbon in carbonyl compounds is

A
$$ sp^2d $$

B
$$ sp^3 $$

C
$$ sp^2 $$

D
$$sp$$

Solution
Question 5
1 / -0

The correct structure representation of carboxylate ion is

A

B

C

D

Solution

The correct structural representation of carboxylate ion is $$RCOO^-$$
Hence, Option "A" is the correct answer.
Question 6
1 / -0

The IUPAC name for the formula
$$CH_{3} - \overset{CH_{3}} {\overset{|} {C}} = \overset{H} {\overset{|} {C}} - COOH $$

A
$$2$$-Methyl-$$2$$-butenoic acid

B
$$3$$-Methyl-$$3$$-butenoic acid

C
$$3$$-Methyl-$$2$$-butenoic acid

D
$$2$$-Methyl-$$3$$-butenoic acid

Solution

The numbering is done from the right-hand side as a carboxylic acid is present in the right-hand side. There is a double bond present at the C-2 position and methyl group at the C-3 position.

Thus, the IUPAC name is: 3-methyl-2-butenoic acid.

Hence, option C is correct.
Question 7
1 / -0

Fill in the blanks by suitable choices .
The carbon atom in carbonyl group is________ hybridised .The carbonyl group in aldehydes and ketones undergoes_______ reactions . Aldehydes which have $$\alpha - H $$ atom undergo______ reaction .

A
$$ sp^{3}$$ , nucleophilic substitutions , aldol condensation , Cannizzaro

B
sp , electrophilic substitution , Cannizzaro , aldol condensation .

C
$$ sp^{2}$$ , nucleophilic addition , aldol condensation Cannizzaro

D
$$ sp^{3}$$ electrophilic addition , Cannizzaro , aldol condensation .

Solution

The carbon atom in carbonyl group is $$ sp^{2}$$ hybridised .The carbonyl group in aldehydes and ketones undergoes nucleophilic addition reactions . Aldehydes which have $$\alpha - H $$ atom undergo aldol condensation reaction .
Hence, Option "C" is the correct answer.
Question 8
1 / -0

Cyclohexanone $$\xrightarrow{Cl_2/NaOH}$$ $$A$$$$\xrightarrow{i)NaOH/H_2O}$$ $$B$$

The product B and type of reaction occurs in conversion of A to B respectively are:

A
Cyclohexanecarboxylic acid, Beckmann Rearrangement

B
Benzoic acid, Wolf Rearrangement

C
Cyclopentanecarboxylic acid, Favorskii Rearrangement

D
Cyclohexanecarboxylic acid, Curtius Rearrangement

Solution

The reaction mechanism is thought to involve the formation of an enolate on the side of the ketone away from the chlorine atom. This enolate cyclizes to a cyclopropanone intermediate which is then attacked by the hydroxide nucleophile.

α-halo ketones which lead to carboxylic acid derivatives. In the case of cyclic α-halo ketones, the Favorskii rearrangement constitutes a ring contraction
Question 9
1 / -0

Rochelle salt is :

A
sodium tartarate

B
sodium potassium tartarate

C
ammonium tartarate

D
potassium ammonium tartarate

Solution

The structure of sodium potassium tartarate shown which is known as Rochelle salt .

Option B is correct.
Question 10
1 / -0

How many moles of ammonia will react with three moles of benzaldehyde to form osazone?

A
2 moles of ammonia

B
1 mole of ammonia

C
3 moles of ammonia

D
4 moles of ammonia

Solution

This is an osazone formation reaction where only 2 moles of ammonia react.

Option A is correct.