Carboxylic acids - acidic strength and reactions — NEET & JEE Questions

Question 1 · difficulty L1 · recall

Carboxylic acids are more acidic than alcohols mainly because their conjugate base is

• A. resonance-stabilised
• B. less electronegative
• C. unable to delocalise charge
• D. always neutral

Question 2 · difficulty L2 · understanding

$$\text { Complete the following reaction sequence and give the name of major product ' } \mathrm{P} \text { '. }$$

• A. 2-Chloropropanoic acid
• B. 3-Chloropropanoic acid
• C. 1-Chloropropane
• D. 2-Chloropropane

Question 3 · difficulty L2 · understanding

Which among the followng has highest boiling point?

• A. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_2-\mathrm{OH}$
• B. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_3$
• C. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CHO}$
• D. $\mathrm{H}_5 \mathrm{C}_2-\mathrm{O}-\mathrm{C}_2 \mathrm{H}_5$

Question 4 · difficulty L2 · understanding

The molecular formula of second homologue in the homologous series of mono carboxylic acids is

• A. $$\mathrm{C}_2 \mathrm{H}_4 \mathrm{O}_2$$
• B. $$\mathrm{C}_2 \mathrm{H}_2 \mathrm{O}_2$$
• C. $$\mathrm{CH}_2 \mathrm{O}$$
• D. $$\mathrm{C}_3 \mathrm{H}_6 \mathrm{O}_2$$

Question 5 · difficulty L2 · understanding

The two products formed in above reaction are -

• A. Butanal and acetaldehyde
• B. Butanoic acid and acetic acid
• C. Butanal and acetic acid
• D. Butanoic acid and acetaldehyde

Question 6 · difficulty L2 · understanding

The total number of 'Sigma' and 'Pi' bonds in 2-formylhex-4-enoic acid is _________.

Question 7 · difficulty L2 · understanding

Consider the above reaction where 6.1 g of Benzoic acid is used to get 7.8 g of m-bromo benzoic acid. The percentage yield of the product is __________ (Round off to the Nearest Integer). [Given : Atomic masses : C : 12.0 u, H : 1.0 u, O : 16.0 u, Br : 80.0 u]

Question 8 · difficulty L2 · understanding

The number of compound/s given below which contain/s -COOH group is __________. (Integer answer) (A) Sulphanilic acid (B) Picric acid (C) Aspirin (D) Ascorbic acid

Question 9 · difficulty L2 · understanding

The carboxyl functional group ($$-$$COOH) is present in

• A. picric acid
• B. barbituric acid
• C. ascorbic acid
• D. aspirin

Question 10 · difficulty L2 · understanding

The correct order of decreasing acidity of the following aliphatic acids is

• A. $\mathrm{HCOOH}>\mathrm{CH}_3 \mathrm{COOH}>\left(\mathrm{CH}_3\right)_2 \mathrm{CHCOOH}>\left(\mathrm{CH}_3\right)_3 \mathrm{CCOOH}$
• B. $\mathrm{HCOOH}>\left(\mathrm{CH}_3\right)_3 \mathrm{CCOOH}>\left(\mathrm{CH}_3\right)_2 \mathrm{CHCOOH}>\mathrm{CH}_3 \mathrm{COOH}$
• C. $\left(\mathrm{CH}_3\right)_3 \mathrm{CCOOH}>\left(\mathrm{CH}_3\right)_2 \mathrm{CHCOOH}>\mathrm{CH}_3 \mathrm{COOH}>\mathrm{HCOOH}$
• D. $\mathrm{CH}_3 \mathrm{COOH}>\left(\mathrm{CH}_3\right)_2 \mathrm{CHCOOH}>\left(\mathrm{CH}_3\right)_3 \mathrm{CCOOH}>\mathrm{HCOOH}$