Carboxylic Acids(11th And 12th > Chemistry ) Questions and Answers

Question 1.



  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 2.




  1.    
  2.    
  3.    
  4.     HCOOH 
Explanation:-
Answer: Option C. ->

:
C

The type acid depends upon R group of Grignard
reagent


Question 3.



  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 4.


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 5.


Which of the following cannot give benzoic acid on oxidation with alkaline KMnO4 followed by acidification


  1.    
  2.    
  3.    
  4.    
Explanation:-
Answer: Option D. ->
:
D

side chain containing 30carbon(or) carbon with out hydrogen will not get oxidised


Question 6.


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 7.



  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


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.


Carboxylic acids are more acidic than phenols, because


  1.     The resonance structures of acid are equivalent while those of phenols are non equivalent
  2.     In resonance structures of phenols negative charge is on more electro positive carbon while   in those of acid it is more electro negative oxygen
  3.     None
  4.     (a) and (b) above.
Explanation:-
Answer: Option D. -> (a) and (b) above.
:
D

Both a & b plays role in more acidic nature of acids


Question 10.


Acetic acid exists as 'X' in vapour state and 'Y' in the liquid state. 'X' and 'Y' are


  1.     Dimer, Polymer
  2.     Trimer, Polymer
  3.     Hexamer, Polymer
  4.     Trimer, Dimer
Explanation:-
Answer: Option A. -> Dimer, Polymer
:
A

In vapour 2 molecules are found together due to inter molecular hydrogen bond & in liquid many molecules are found together due to inter molecular hydrogen bond


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