This set of Organic Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Dihydric Alcohols”.
1. How many hydroxyl groups are present in diols?
Explanation: Any of a class of alcohols that have two hydroxyl groups in each molecule are diols or dihydric alcohol.
2. Which of the following is not the example of dihydric alcohol?
Explanation: Glycerin is a trihydroxy alcohol i.e. Glycerol, is a simple polyol compound. It is a colorless, odorless, viscous liquid that is sweet-tasting and non-toxic. Structure of glycerin is
Explanation: Catechol is dihydric alcohol, in which hydroxyl group is attached adjacent to each other in benzene ring.
Explanation: Parahydroxyphenol is dihydric alcohol, in which hydroxyl group is attached at 1, 4 positions to each other in benzene ring.
Explanation: Resorcinol is dihydric alcohol, in which hydroxyl group is attached at 1, 3 positions to each other in benzene ring.
6. What is the general formula for dihydric alcohol?
a) (CH2)n(OH)2 where n = 2,3…etc
b) (CH2)n(OH)2 where n = 1,2,4… etc
c) CnH2n+1OH where n = 1, 2 …etc
d) (CH2)n(OH)3 where n = 3, 4, 5 …etc
Explanation: Dihydric alcohol have general formula (CH2)n(OH)2, where n = 2,3,4 etc.
Explanation: Cold dilute alkaline solution of Bayer’s reagent can be used to carry out this synthesis.
8. Which type of product is formed when Cold dilute alkaline solution of Bayer’s reagent reacts with alkene?
c) syn- and anti-geometry will not be there in diol
d) Trans diol
Explanation: On hydroxylation product is formed when Cold dilute alkaline solution of Bayer’s reagent reacts with alkene is syn.
Explanation: A peroxy acid can be used to carryout this synthesis as shown in below reaction.
10. How can we detect the presence of resorcinol in the solution?
a) Ceric ammonium nitrate test
b) Lucas test
c) Phthalic acid test
d) Remini’s test
Explanation: Phthalic acid test:The anhydrides of aromatic 1,2-dicarboxylic acids on heating with resorcinol gives a dye fluorescein. This dye in NaOH solution gives a yellowish red solution with green fluorescence.
Sanfoundry Global Education & Learning Series – Organic Chemistry.
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