Aldehydes Ketones and Carboxylic Acids Test

Result

Aldehydes Ketones and Carboxylic Acids Test - 34

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Weekly Quiz Competition

Question 1
1 / -0

Identify $$(X),\ (Y) $$ and $$(Z)$$ reagents in the given sequence of reaction. $$CH_3COCH_3\xrightarrow[heat]{I_2+NaOH} X \xrightarrow[heat]{Ag} Y \xrightarrow[heat]{H_2SO_4/HgSO_4} Z$$

A
$$ X = CHI_3, \, Y = CH_3CHO, \, Z = HCHO$$

B
$$ X = CHl_3, \, Y = CH_3OH, \, Z = CH_3CHO$$

C
$$ X = CHl_3, \, Y = CH\equiv CH, \, Z = CH_3CHO$$

D
$$X = CH_3COCl_3, \, Y = CH_2=CH_2, \, Z = CH_3CHO$$
Question 2
1 / -0

$${({C}_{2}{H}_{5}))}_{2}CO\xrightarrow [ { CH }_{ 3 }MgBr\ (excess) ]{ { H }_{ 3 }{ O }^{ + } } A$$. $$A$$ (alcohol) can also be obtained by:

A
$${CH}_{3}{CH}_{2}CHO\xrightarrow [ { CH }_{ 3 }MgBr\ (2\ mol) ]{ { H }_{ 3 }{ O }^{ + } } $$

B
$$CH_3\overset{O}{\overset{||}{C}}OC_2H_5 \xrightarrow[H_3O^+]{CH_3MgBr(2 \, mol)}$$

C
$$CH_3\overset{O}{\overset{||}{C}}CH_3 \xrightarrow[H_3O^+]{CH_3MgBr(1 \, mol)}$$

D
both $$B$$ and $$C$$

Solution

(Refer to Image 1)
A. (Refer to Image 2)
B. (Refer to Image 3)
C. (Refer to Image 4)
So, options B and C give same alcohol.
Question 3
1 / -0

Product A in the given reaction is:

A

B

C

D

Solution

Cyanide on hydrolysis produced carboxylic acid. Decarboxylation occurs when two carboxylic acids are attached to one carbon on heating.
Refer to image
Question 4
1 / -0

Consider the above sequence and answer the following
Conversion $$R- CHO \rightarrow R-CO_2H$$ can be done by :

A
$$KMNO_4$$

B
$$H_2CrO_4$$

C
$$K_2Cr_2O_7$$

D
All of these

Solution

Strong oxidizing agents like alkaline $$KMnO_4$$, $$H_2CrO_4$$ and acidified $$K_2Cr_2O_7$$ can oxidize aldehyde group to carboxylic acid and alcohol group to carboxylic group.

(i) $$R-CHO \xrightarrow []{Alk.KMnO_4} R-COOH$$
(ii) $$R-CHO \xrightarrow []{H_2CrO_4} R-COOH$$
(iii) $$R-CHO \xrightarrow []{K_2Cr_2O_7} R-COOH$$
Question 5
1 / -0

Product (P) of the reaction is :

A

B

C

D

Solution
Question 6
1 / -0

The correct order of rate of reaction toward nucleophilic addition reaction.

A
a $$>$$ b $$>$$ c $$>$$ d $$>$$ e

B
a $$>$$ b $$>$$ d $$>$$ c $$>$$ e

C
a $$>$$ d $$>$$ e $$>$$ b $$>$$ c

D
a $$>$$ b $$>$$ e $$>$$ d $$>$$ c

Solution

Rate towards Nucleophilic addition is high when electron density is low at carbonyl carbon. So, the groups attached should be electron withdrawing groups and aldehyde has high rate compared to ketone because of less steric hindrance.
$$-NO_2$$= Electron withdrawing; $$-OMe$$= electron donating
$$\Rightarrow a>b>c>d>e$$
Question 7
1 / -0

The final product of the following sequence of reaction is?
$$(CH_3O)_2CHCH_2CH_2CH_2Br\overset{Mg}{\rightarrow}\overset{H_2C=O}{\rightarrow}\overset{H_3O^+}{\underset{heat}{\rightarrow}}$$

A
$$CH_3O\overset{O}{\overset{||}{C}}CH_2CH_2CH_2CH_2OH$$

B
$$CH_3\overset{O}{\overset{||}{C}}CH_2CH_2CH_2CH_2OH$$

C
$$H\overset{O}{\overset{||}{C}}CH_2CH_2CH_2CH_2OH$$

D
$$H\overset{O}{\overset{||}{C}}CH_2CH_2CH_2\overset{O}{\overset{||}{C}}H$$

Solution

$$R-Br$$ on reaction with Magnesium form Grignard Reagent $$RMgBr$$.
(Refer to Image)
Question 8
1 / -0

Product (A) is?

A

B

C

D

Solution

The hydrogens between two keto groups are highly acidic.
(Refer to Image)
Question 9
1 / -0

Which molecule will give the following dicarboxylic acid on heating with acidic solution of $$KMnO_4$$?

A

B

C

D

Solution
Question 10
1 / -0

Which one of the following compounds is the best choice for being prepared by an efficient mixed aldol addition reaction?

A

B

C

D

Solution

The efficient mixture formed depends to the acidity of hydrogen to be removed and bulkiness of aldehyde that is attacked
Here, Refer to Image