Aldehydes Ketones and Carboxylic Acids Test

Result

Aldehydes Ketones and Carboxylic Acids Test - 40

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Product is

A

B

C

D

Solution
Question 2
1 / -0

Cyanohydrin of which of the following gives lactic acid on hydrolysis ?

A
$${ CH }_{ 3 }{ COCH }_{ 3 }$$

B
$${ CH }_{ 3 }{ CHO }$$

C
$${ C }_{ 6 }{ H }_{ 5 }{ CH }_{ 2 }CHO$$

D
$$HCHO$$

Solution

Cyano hydrin of acetone upon hydrolysis gives the lactic acid compound.it is a type nucleophilic addition reaction followed by elimination of water molecule.
Question 3
1 / -0

A

B

C

D

Solution
Question 4
1 / -0

A compound 'X' gives brisk effervescence of $$CO_2$$ on treatment with $$NaHCO_3$$ and when treated with $$LiAlH_4$$ gives ethyl alcohol. Therefore 'X' may be:

A
$$CH_3COCH_3$$

B
$$CH_3CH_2CHO$$

C
$$CH_3CHO$$

D
$$CH_3COOH$$

Solution

$$CH_3 - \overset{O}{\overset{||}{C}} - OH + NaHCO_3 \rightarrow CO_2 + H_2O + CH_3 \overset{O}{\overset{||}{C}} O - Na$$
$$ CH_3 - \overset{O}{\overset{||}{C}} - OH + LiAlH_4 \rightarrow CH_3 - CH_2 OH$$
Question 5
1 / -0

The product "A" in the above reaction is:

A

B

C

D
Question 6
1 / -0

Give the decreasing order of nucleophilic addition reaction of the following :
(i) $$ { HCHO }$$ (ii) $$PhCHO$$
(iii) Chloral $$\left( \mathrm { Cl } _ { 3 } \mathrm { C } - \mathrm { CH } = O \right)$$ (iv) $$Acetophenone$$

A
$$(iii)>(i)>(ii)>(iv)$$

B
$$(iv) > (i i) > (i) > (iii)$$

C
$$(i) > (iii) > (ii )> (iv)$$

D
$$(iii)>(i)>(iv)>(ii)$$

Solution

Aldehydes are more reactive towards Nucleophillic substitution compared to ketones because of less steric hindrance. In Aldehydes electron withdrawing group increase its reactivity when present.
Here, $$CCl_3-$$ is an electron withdrawing group. So, it increases reactivity.
$$CCl_3-CHO-$$ Electron withdrawing agent.
$$HCHO-$$ Very less steric hindrance.
$$ph-CHO$$ Aldehyde- Little bulky.
Acetophenone- Ketone.
$$CCl_3-CHO>HCHO>ph-CHO>$$ Acetophenone
Question 7
1 / -0

Which of the following carboxylic acid is most acidic in character -

A
o-methyl benzoic acid

B
m-methyl benzoic acid

C
p-methyl benzoic acid

D
Benzoic acid

Solution

Acidity $$\propto \cfrac{1}{+I}$$
Methyl group shows +I effect. Hence, Benzoic acid is the most acidic one.
Option D is correct.
Question 8
1 / -0

Which of the following forms a stable hydrate

A
$$C{H_3}COC{H_3}$$

B
$$C{H_3}CHO$$

C
$$C{l_3}CCHO$$

D
$$HCHO$$

Solution
Question 9
1 / -0

Which of the following carboxylic acids can be decarboxylated readily by heating to $$100 - 150^{\circ}C$$ ?

A
$$CH_3COCH_2COOH$$

B
$$CH_3COOH$$

C
$$CH_2 = CH - CH_2- COOH$$

D
$$CH_3CH_2COOH$$

Solution

$$\beta\ Keto\ acid$$ which undergoes decarboxylation in very mild condition, i.e. on simple heating.
From given options:$$CH_3C^{\beta}OC^{\alpha}H_2COOH$$ this compound possess $$\beta\ keto\ acid$$. So, $$CH_3C^{\beta}OC^{\alpha}H_2COOH$$ will go fastest decarboxylation as it is a $$\beta\ Keto\ acid$$.
$$\beta\ Keto\ acid$$ on slight heating decarboxylates and gives ketone as follows:
$$CH_3COCH_2COOH\xrightarrow{-H_2O} CH_3COCH_3+CO_2$$

Hence option A is correct answer.
Question 10
1 / -0

When the reaction of $$Br_2$$ with acetone is catalysed by hydroxide ion, which of the following are the likely products ?

A
$$CHBr_3$$ and acetate ion

B
Bromoacentic acid

C
Tribromoacetic acid

D
Acetyl bromide

Solution

$$O$$ $$O$$
$$\underset {Acetone}{CH_3-\overset {||}{C}-CH_3+Br_2 \xrightarrow []{{^\circleddash}OH}} \underset {Acetate Ion}{CH_3-\overset {||}{C}-O^{\circleddash}} +CHBr_3$$
It is a type of Haloform reaction which takes place in presence of $$Br_2$$ in basic medium.