Aldehydes Ketones and Carboxylic Acids Test

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Aldehydes Ketones and Carboxylic Acids Test - 49

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following reactions will give $$\displaystyle \alpha -$$ hydroxy acid as a product?

A
$$\displaystyle CH_{3}-CHO\xrightarrow[\left ( ii \right )H_{2}O/H^{\oplus }/\Delta ]{\left ( i \right )NaCN/HCl}$$

B
$$\displaystyle CH_{3}-CHO+Br-CH_{2}-COOC_{2}H_{5}\xrightarrow[\begin{matrix}

\left ( ii \right )NH_{4}Cl/HOH\\

\left ( iii \right )HOH/H^{\oplus }/\Delta

\end{matrix}]{\left ( i \right )Zn}$$

C
$$\displaystyle CH_{3}-COOH\xrightarrow{NaOH/HOH}$$

D
All of these

Solution

Treatment of acetaldehyde with sodium cyanide in presence of HCl gives acetaldhyde cyanohydrin.
This is followed by hydrolysis of cyano group in presence of acid to form hydroxy acid as a product which is 2-hydroxy propanoic acid.
Question 2
1 / -0

In the given reaction, the product $$(B)$$ is :

$$\displaystyle CH_{3}CHO\xrightarrow[\left ( ii \right )H_{2}O/H^{\oplus }/\Delta ]{\left ( i \right )NaCN/HCl}\left ( A \right )\xrightarrow[reagent]{Fenton}\left ( B \right )$$

A
acetic acid

B
oxalic acid

C
pyruvic acid

D
citric acid

Solution

Treatment of acetaldehyde with sodium cyanide in the presence of $$HCl$$ gives acetaldehyde cyanohydrin.

This is followed by hydrolysis of cyano group in the presence of acid to form compound $$A$$, which is $$2$$-hydroxy propanoic acid.

The hydroxyl group is then oxidized to carbonyl group with fenton reagent to obtain compound $$B$$, which is Pyruvic acid.

Option C is correct.
Question 3
1 / -0

What will be the product of the following reaction :
(according to OPTIONS in the image shown)

A
B

B
C

C
D

D
A

Solution

Aniline acts as a nucleophile and attacks the two carbonyl carbons in stepwise manner to form a five member ring.
This is followed by loss of two molecules of water to give the end product.
Question 4
1 / -0

In the given reaction,
$$ CH_3COCH_3 \xrightarrow{CH_3C\equiv \overset{\Theta}{C}\overset{\oplus }{Na}} X \xrightarrow[]{H_2O} Y\xrightarrow[]{H_2-Pd/CaCO_3}Z\xrightarrow[]{Al_2O_3} $$ W, W is:

A
$$CH_2=CH-CH=CH_2$$

B
$$CH_3-CH=CH-CH=CH_2$$

C
$$(CH_3)CH=CH-C(CH_3)=CH_2$$

D
$$CH_3CH=CH-CH=CH-CH_3$$

Solution

First step is the nucleophilic addition of sodium prop-2-yn-1-ide to carbonyl carbon of acetone to give compound X. This is followed by protonation to give compound Y. Hydrogenation with Lindlar's catalyst reduces triple bond to double bond to give compound Y. This is followed by dehydration in the presence of alumina to give compound W.
Hence, compound D is represented by option C.
$$CH_3COCH_3 \xrightarrow{CH_3C\equiv \overset{\Theta}{C}\overset{\oplus }{Na}} \underset {X} {CH_3C \equiv C-C(CH_3)_2-O^-} \xrightarrow[]{H_2O} \underset {Y} {CH_3C \equiv C-C(CH_3)_2-OH}$$
$$\xrightarrow[]{H_2-Pd/CaCO_3}\underset {Z} {CH_3CH=CH-C(CH_3)_2-OH} \xrightarrow[]{Al_2O_3} \underset {W} {CH_3CH=CH-C(CH_3)=CH_2}$$
Question 5
1 / -0

The IUPAC name of the compound given below is:
$$ CH_{3}CH_{2}CO CH_{2} CH_{3}$$

A
1-pentanone

B
2-pentanone

C
2-carboxybutane

D
3-pentanone
Question 6
1 / -0

Compound 'P' of the following reaction sequence can be :

A

B

C

D

Solution

The compound $$P$$ is acetylene benzene as it forms $$C_8H_6O_3$$ on ozonolysis. Hence, the formula of the compound should be $$C_8H_6$$.
Question 7
1 / -0

Which of the following compound cannot have the condensed formula $$C_5H_{10}O$$?

A
An aldehyde

B
A ketone

C
An alkenol

D
A cyclic ketone

Solution
Question 8
1 / -0

IUPAC name of the following compound is:

A
6-ethyl-1,4, 6-octanetrioic acid

B

5-Ethyl -hexane-1, 3, 6-tricarboxylic acid

C
3-ethyl-5-carboxyoctanedioic acid

D
4-carboxy-6-ethyloctanedioic acid

Solution

The IUPAC name of the above compound is 5-Ethyl- hexane-1, 3, 6-tricarboxylic acid.

The parent compound contains 6 C atoms and is named hexane. Three carboxylic groups $$\displaystyle (-COOH)$$ are present as a substituent and named as suffix tricarboxylic acid.

An ethyl group is present as a substituent on the fifth C atom.
Question 9
1 / -0

Which of the following compound would be appropriate for the synthesis of amino acid (2)?

A
2-methyl propanal

B
2-methyl propanoic acid

C
3-methyl butanal

D
3-methyl butanoic acid

Solution
Question 10
1 / -0

What is the final product of the above reaction sequence?

A

B

C

D

Solution

$$S_N2$$ reaction at $$sp^3$$ carbon followed by hydrolysis of cyano group as