Organic Chemistry Multiple Choice Questions on “Dihydric Alcohols”.
1. How many hydroxyl groups are present in diols?
a) One
b) Two
c) Three
d) Four
Answer: b
Clarification: 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?
a) Glycerin
b) Parahydroxyphenol
c) Resorcinol
d) Catechol
Answer: a
Clarification: 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
3. Which of the following is the correct structure of catechol?
a) 
b) 
c) 
d) 
Answer: b
Clarification: Catechol is dihydric alcohol, in which hydroxyl group is attached adjacent to each other in benzene ring.
4. Which of the following is the correct structure of parahydroxyphenol?
a)
b)
c)
d)
Answer: c
Clarification: Parahydroxyphenol is dihydric alcohol, in which hydroxyl group is attached at 1, 4 positions to each other in benzene ring.
5. Which of the following is the correct structure of resorcinol?
a)
b)
c)
d)
Answer: a
Clarification: 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
Answer: b
Clarification: Dihydric alcohol have general formula (CH2)n(OH)2, where n = 2,3,4 etc.
7. Which of the following reagent can be used to carry out this synthesis?
a) Seliwanoff reagent
b) Baeyer’s reagent
c) Barfoed reagent
d) Benedict reagent
Answer: b
Clarification: Cold dilute alkaline solution of Bayer’s reagent can be used to carry out this synthesis.
