12th class (Fsc) Chemistry unit 12 MCQs
76. Aldehydes on reduction form:
a. Tertiary alcohols
b. Primary alcohols
c. Ketones
d. Secondary alcohols
77. Which one of the following reaction is used for detecting the presence of carbonyl group:
a. Reaction with 2,4- dinitrophenyl hydrazine
b. Reaction with hydroxylamine
c. Reaction with hydrazine
d. All of the above
78. Aldehyde and ketones can be detected by:
a. Sodium nitropraade test
b. 2,4 DNPH test
c. Tollen’s test
d. None of these
79. Consider the following reaction: R-CHO+2[Ag(NH3)2]OH → RCOONH4 +2Ag+2NH3 +H2O this reaction represents one of the following test:
a. Benedict test
b. Fehling test
c. Tollens test
d. Ninhydrine test
80. Which one of the following is also called silver mirror test?
a. Tollen’s reagent
b. Fehling’s solution test
c. Benedict’s solution test
d. Iodoform test
81. Both aldehydes and ketones are planer to the neighborhoods of carbonyl group one of the following bonds is distorted towards the oxygen atoms?
a. Sigma bond of C and H
b. Pi bond of C and O
c. Sigma bond of C and C
d. Sigma bond of C and O
82. Which one of the following tests is given by both aldehyde and ketone?
a. Fehlings’s test
b. Silver mirror test
c. Benedict’s solution test
d. 2,4-DNPH test
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