Carboxylic Acids(12th Grade > Chemistry ) Questions and Answers

Question 1. An organic compound 'X' gives brisk effervescence with NaHCO3 and also reduces Tollen's reagent. 'X' is
  1.    CH3COOH
  2.    CH3CHO
  3.    CH3COCH3
  4.    HCOOH
Explanation:-
Answer: Option D. -> HCOOH
:
D
NaHCO3 test is for acid and HCOOH has both acid and aldehyde group
Question 2. The acid 'D' obtained through the following
sequence of reactions is The Acid 'D' Obtained Through The Followingsequence Of React...
  1.    Succinic acid 
  2.    Malonic acid
  3.    Maleic acid  
  4.    Oxalic acid
Explanation:-
Answer: Option A. -> Succinic acid 
:
A
A is ethylene, B is vicdibromide , C is NC - CH2 - CH2 -
CN
Question 3. When CH2 = CH - COOH is reduced with LiAlH4 , the compound formed is
  1.    CH3CH2CH2OH
  2.    CH3CH2CHO
  3.    CH3CH2COOH
  4.    CH2 = CH - CH2OH
Explanation:-
Answer: Option D. -> CH2 = CH - CH2OH
:
D
LiAlH4 cannot reduce double bond
Question 4. Among the i) alkanes   ii) akyl halide iii) ether iv) alcohol v) carboxylic acid
having the same molecular weight, the one with highest boiling point and reason are
  1.    Alcohol , H - bonding
  2.    Acid, cyclic dimer due to H - bonds
  3.    Alcohols ,vander walls forces
  4.    All have same boiling point
Explanation:-
Answer: Option B. -> Acid, cyclic dimer due to H - bonds
:
B
Carboxylic acid havestrong hydrogen bond
Question 5.
  1.    Adipic acid
  2.    Terephthalic acid
  3.    Phthalic acid
  4.    Benzoic acid
Explanation:-
Answer: Option B. -> Terephthalic acid
:
B
It is oxidation and - COOH groups are in para position
Question 6. Which of the following cannot give benzoic acid on oxidation with alkaline KMnO4 followed by acidification
Explanation:-
Answer: Option B. -> Terephthalic acid
:
D
side chain containing 30carbon(or) carbon with out hydrogen will not get oxidised
Question 7.
  1.    A and P are different but C and Q are same
  2.    A and P are different but C and Q are different
  3.    A and P are same but C and Q are same
  4.    C and Q are benzaldehyde
Explanation:-
Answer: Option C. -> A and P are same but C and Q are same
:
C
in oxidation of side chain only one carbon of aromatic ring is retained
Question 8. Here A, B, X & Y Are
Here A, B, X & Y are
  1.    X = CH3COC2H5, Y = CH3COOH, A = C2H5OH, B = CH3COOK
  2.    X = CH3COC2H5, Y = C2H5OH, A = CH3COOH, B = CH3COOK
  3.    X = CH3COCH3, Y = CH3COOH, A = CH3COOK, B = C2H5OH
  4.    X = CH3COOC2H5, Y = CH3COOH, A = CH3COOK, B = C2H5OH
Explanation:-
Answer: Option D. -> X = CH3COOC2H5, Y = CH3COOH, A = CH3COOK, B = C2H5OH
:
D
First reaction saponification of ester & Last reaction is neutralisation
Question 9.
  1.    CH3 - CH2 - CH2OH
  2.    CH3 - CO - CH3
  3.    CH3 - CHO
  4.    CH3 - O - CH3
Explanation:-
Answer: Option B. -> CH3 - CO - CH3
:
B
A = (CH3COO)2Ca; B = CH3 - CO -CH3
Question 10.
  1.    D    A    B    C
  2.    C    B    D    A
  3.    D    C    B    A
  4.    C    A    B    D
Explanation:-
Answer: Option C. -> D    C    B    A
:
C
B2H6 can reduce acid to 10alcohol
© Lakshya_Education.com, All Right Reserved.
Contact Us services