Aldehydes, Ketones and Carboxylic Acids  MCQs

MCQs of Aldehydes, Ketones and Carboxylic Acids

Showing 91 to 100 out of 162 Questions
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91.
On reduction of acrolein (CH2 = CH - CHO) by LiAIH4 _____ .
(a) only -CHO group will be reduced
(b) only C = C will be reduced
(c) both -CHO and C = C will be reduced
(d) neither -CHO nor C = C will be reduced
Answer:

Option (a)

92.
Which of the following compounds will not give iodoform test ?
(a) Ethanal
(b) Ethanol
(c) Pent - 3 - one
(d) But - 2 - one
Answer:

Option (c)

93.
Which of the following chemical reagents should be used to distinguish between glucose and benzaldehyde ?
(a) Ammoiniacal AgNO3
(b) Alkaline solution CuSO4 + Sodium potassium tartarate solution.
(c) Hydrazine + KOH
(d) Phenyl hydrazine
Answer:

Option (b)

94.
Which of the following aldehydes will undergo Cannizzaro reaction ?
(a) m - chlorobenzaldehde
(b) Acetaldehyde
(c) Acetone
(d) Butanal
Answer:

Option (a)

95.
Which of the following compounds on reduction by LiAIH4 will form an optically active compound ?
(a) Propanal
(b) Acetone
(c) Butan - 2 - one
(d) Pentan - 3 - one
Answer:

Option (c)

96.
What is the precipitate produced when glucose reacts with Fehling solution ?
(a) CuO
(b) Cu2O
(c) Cu
(d) Cu(OH)2
Answer:

Option (b)

97.
In which of the following reaction is new C - C bond formed ?

(i) Cannizzaro reaction

(ii) Friedel Craft reaction

(iii) Clemmensen reduction

(iv) Reimer Tiemann reaction

(a) (i) and (iii)
(b) (ii) and (iv)
(c) (ii) and (iii)
(d) (iii) and (iv)
Answer:

Option (b)

98.
Which of the following statements is correct with respect to aldol condensation reaction ?
(a) Dilute HCL is used for this reaction
(b) Concentrate NaOH is used for this reaction.
(c) H-atom on α - carbon is necessary for this reaction.
(d) -OH group is necessary on α - carbon for this reaction.
Answer:

Option (c)

99.
Find the wrong statements from the following :

(i) All aldehydes and ketones give Tollen's test.

(ii) Acids obtained by oxidation of all the aldehydes contain one C-atom less than the parent aldehydes.

(iii) Benzaldehyde undergoes Cannizzaro reaction.

(iv) Nucleophilic addition reaction is the characteristic of carbonyl group

(a) (i) and (ii)
(b) (ii) and (iv)
(c) (iii) and (iv)
(d) Only (iv)
Answer:

Option (a)

100.
An organic compound X gives hydrazone when heated with hydrazine in presence of acid. It does not give red precipitate of Cu2O when heated with Fehling A + Fehling B solution. Its oxidation gives a carboxylic acid containing one carbon atom less. Identify the compound X.
(a) C6H5COCH3
(b) C6H5CHO
(c) C6H5CH2OH
(d) CH3CHO
Answer:

Option (a)

Showing 91 to 100 out of 162 Questions
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