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
CH3COOH
CH3CHO
CH3COCH3
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
Succinic acid
Malonic acid
Maleic acid
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
CH3CH2CH2OH
CH3CH2CHO
CH3CH2COOH
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
Alcohol , H - bonding
Acid, cyclic dimer due to H - bonds
Alcohols ,vander walls forces
All have same boiling point
Explanation:-
Answer: Option B. -> Acid, cyclic dimer due to H - bonds : B Carboxylic acid havestrong hydrogen bond
Question 5.
Adipic acid
Terephthalic acid
Phthalic acid
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.
A and P are different but C and Q are same
A and P are different but C and Q are different
A and P are same but C and Q are same
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
X = CH3COC2H5, Y = CH3COOH, A = C2H5OH, B = CH3COOK
X = CH3COC2H5, Y = C2H5OH, A = CH3COOH, B = CH3COOK
X = CH3COCH3, Y = CH3COOH, A = CH3COOK, B = C2H5OH
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.
CH3 - CH2 - CH2OH
CH3 - CO - CH3
CH3 - CHO
CH3 - O - CH3
Explanation:-
Answer: Option B. -> CH3 - CO - CH3 : B A = (CH3COO)2Ca; B = CH3 - CO -CH3
Question 10.
D A B C
C B D A
D C B A
C A B D
Explanation:-
Answer: Option C. -> D C B A : C B2H6 can reduce acid to 10alcohol