Aldehydes Ketones and Carboxylic Acids Test

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Aldehydes Ketones and Carboxylic Acids Test - 70

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Weekly Quiz Competition

Question 1
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Carboxylic acids can be prepared from alcohols, nitriles or esters.
Which statements are correct?
$$1$$. Both primary and secondary alcohols can be oxidised to carboxylic acids.
$$2$$. Carboxylic acids can be made from nitriles by hydrolysis.
$$3$$. Ethyl propanoate gives propanoic acid when reacted with hydrochloric acid.

A
$$1, 2$$ and $$3$$ are correct

B
$$1$$ and $$2$$ only are correct

C
$$2$$ and $$3$$ only are correct

D
$$1$$ only is correct

Solution

Solution:- (C) $$2$$ and $$3$$ only are correct.
Primary alcohols can be oxidised to aldehyde or carboxylic acids depending on the reaction conditions and secondary alcohols are oxidised to ketones.
The hydrolysis of nitriles, which are organic molecules containing a cyano group, leads to carboxylic acid formation. These hydrolysis reactions can take place in either acidic or basic solutions.
Ethyl propanoate reacts with dilute hydrochloric acid and gives propanoic acid. The ester reacts with the water present to produce propanoic acid and ethanol. The dilute acid provides both the acid catalyst and the water.

Hence statements $$2$$ and $$3$$ are correct.
Question 2
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The major product $$'Y'$$ in the following reaction is:

A

B

C

D

Solution

-
Question 3
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Nucleophilic addition reaction will be most favoured in

A
$$ CH_3 CH_2 CHO $$

B
$$ CH_3 CHO $$

C
$$ CH_3 CH_2 CH_2 -\overset { \overset { O }{ \parallel } }{ C } - CH_3 $$

D
$$ (CH_3)_2C = 0 $$

Solution

Nucleophilic addition reaction will be most favoured in the compounds with least electron density at CO bond.

Order of electron density at CO bond in the given compounds:
$$\mathrm{B<A<D<C}$$

So, Nucleophilic addition reaction will be most favored in $$\mathrm{CH_3CHO}$$.

Hence, Option "B" is the correct answer.
Question 4
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The formation of cyanohydrin from a ketone is an example of:

A
electrophilic addition

B
nucleophilic addition

C
nucleophilic substitution

D
electrophilic substitution

Solution
Question 5
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Which of the following is used as a hypnotic?

A
Paraldehyde

B
Metaldehyde

C
Acetaldehyde

D
Formaldehyde

Solution
Question 6
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Acetone+A $$ \rightarrow $$ oxime of acetone
Acetone+B $$ \rightarrow $$ diacetone amine
Acetone+C $$ \rightarrow $$ mesitylene
Acetone+D $$ \rightarrow $$ isopropylidene chloride A,B,C and D are:

A
$$ NH_2OH,NH_3,Conc.H_2SO_4,SOCl_2 $$

B
$$ HNO_2,NH_3,Conc.H_2SO_4,PCl_5 $$

C
$$ HNO_2,NH_3,Conc.H_2SO_4,Cl_2 $$

D
$$ NH_2OH,NH_3,H_2SO_4,Cl_2 $$

Solution
Question 7
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Paraldehyde is used as a:

A
medicine

B
poison

C
polymer

D
dye

Solution

Uses for paraldehyde: $$medicinal\ use$$
Paraldehyde is $$\text{used to treat certain convulsive disorders.}$$ It also has been used in the treatment of$$ alcoholism$$ and in the treatment of $$nervous \ and \ mental \ conditions$$ to calm or relax patients who are nervous or tense and to produce sleep.
Question 8
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Which has minimum reactivity towards nucleophiles?

A
Butanone

B
Propanone

C
Ethanal

D
Methanal

Solution
Question 9
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Which of the following is not the functional isomer of monocarboxylic acid?

A
Amide

B
Ester

C
Hydroxy aldehyde

D
Hydroxy ketone

Solution

Consider the acid : $$C_2H_5COOH$$ i.e $$C_3H_6O_2$$

(A) Amide : $$C_3H_7ON$$
(B) Ester: $$C_3H_6O_2$$
(C) Hydroxy Aldehyde: $$C_3H_6O_2$$
(D) Hydroxy Ketone: $$C_3H_6O_2$$

Hence option (A) is the answer.
Question 10
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Unknown compound $$(A)$$ on oxidation with hot basic $$KMnO_{4}$$ gives only one compound whose structure is given in the figure.

Compound $$(A)$$ will be:

A
$$CH_{3} - C \equiv C - (CH_{2})_{4} - C \equiv C - CH_{3}$$

B
$$CH_{3} - CH = CH - (CH_{2})_{4} - CH = CH_{2}$$

C
$$CH_{3} - CH = CH - (CH_{2})_{4} - CH = CH - CH_{3}$$

D