Physical Properties of Ethers Flashcards
- Which of the following is distinguish test for ether?
a) Lucas test
b) FeCl3 test
c) Molisch test
d) Zeisel test
d) Zeisel test
- Which of the following statement is not true about
ethers?
a) The lower ethers are highly volatile and flammable
b) Lower ethers also act as anaesthetics
c) Ethers are not organic solvents
d) Simple ethers (such as diethyl ether) are tasteless
c) Ethers are not organic solvents
- Why ether is more volatile than an alcohol having the
same molecular formula?
a) dipolar character of ethers
b) alcohols having resonance structures
c) inter-molecular hydrogen bonding in ethers
d) inter-molecular hydrogen bonding in alcohols
d) inter-molecular hydrogen bonding in alcohols
- Why the boiling point of ethyl alcohol is much higher
than that of dimethyl ether though
both have the same molecular weight?
a) Ether is insoluble in water
b) Methyl groups are attached to oxygen in ether
c) Dipole moment of ethyl alcohol is less
d) Ethyl alcohol shows hydrogen bonding
d) Ethyl alcohol shows hydrogen bonding
- Which of the following has lower boiling point than
dimethyl ether?
a) Pentane
b) Propane
c) Tetrahydrofuran
d) n-butanol
b) Propane
- Which of the following product is formed, when ether is
exposed to air?
a) Oxide
b) Alkanes
c) Alkenes
d) Peroxide of diethyl ether
d) Peroxide of diethyl ether
- An organic compound A reacts with sodium metal and
forms B. On heating with conc. H2SO4, A gives diethyl
ether. What are A and B?
a) C2H5OH and C2H5ONa
b) C3H7OH and CH3ONa
c) CH3OH and CH3ONa
d) C4H9OH and C4H9ONa
d) C4H9OH and C4H9ONa
- What is the smell of the diethyl ether?
a) Vinegar
b) Sweet smell
c) Rotten egg
d) Fish like smell
b) Sweet smell
- Which of the following statements about ethers is
incorrect?
a) Ethers are flammable
b) Ethers form peroxides by free radical oxidation
c) Ethers are widely used as extraction solvents
d) An ether oxygen can only be found within an acyclic
carbon chain
d) An ether oxygen can only be found within an acyclic
carbon chain
- How many hydroxyl groups are present in diols?
a) One
b) Two
c) Three
d) Four
b) Two
- Which of the following Is the correct reason for cyclic
ether are miscible in water?
a) Planer structure
b) Larger size
c) Molecular weight
d) Hydrogen bonding
d) Hydrogen bonding
- 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
b) (CH2)n(OH)2 where n = 1,2,4… etc
- Which of the following is not the example of dihydric
alcohol?
a) Glycerin
b) Parahydroxyphenol
c) Resorcinol
d) Catechol
a) Glycerin
- Which Biomolecules simply refers as “Staff of life” in the
given macromolecules?
a) Protein
b) Lipids
c) Carbohydrate
d) Vitamins
c) Carbohydrate
- Which type of product is formed when Cold dilute
alkaline solution of Bayer’s reagent reacts with alkene?
a) Syn-diol
b) Anti-diol
c) syn- and anti-geometry will not be there in diol
d) Trans diol
a) Syn-diol
- Majority of the monosaccharides found in the human
body are of which type stereoisomer?
a) L-type
b) D-type
c) neutral
d) racemic mixture
b) D-type
- Which compound is used with 1,2- dibromoethane for
the formation of glycol?
a) Na2CO3
b) NaHCO3
c) NaOH
d) CH3COONa
a) Na2CO3
- Which of the following statement is not true about
preparation of alcohol?
a) French chemist Charles-Adolphe Wurtz (1817–1884)
first prepared ethylene glycol in 1856
b) First synthesis of glycol was from “ethylene iodide”
(C2H4I2) with silver acetate and then hydrolyzed the
resultant “ethylene diacetate” with potassium hydroxide
c) It was synthesized from ethylene dichloride in Germany
and used as a substitute for glycerol in the explosives
industry
d) There is no biological process for the synthesis of glycol
d) There is no biological process for the synthesis of glycol
- 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
c) Phthalic acid test
- Which is the simplest carbohydrate?
a) Dihydroxy acetone
b) Glycerldehyde
c) Glucose
d) Gulose
b) Glycerldehyde
- In carbohydrates which are the main functional groups
are present?
a) Alcohol & Carboxyl groups
b) Aldehyde & Ketone groups
c) Hydroxyl groups & Hydrogen groups
d) Carboxyl groups & Others
a) Alcohol & Carboxyl groups
- Which of the following is true about Turanose?
a) Reducing disaccharides of glucose and fructose
b) Non-reducing disaccharide
c) 7-methyl sugar
d) a deoxy sugar
a) Reducing disaccharides of glucose and fructose
- Which of the following is the examples of Epimers?
a) Glucose & Galactose
b) Glucose & Ribose
c) Mannose & Glucose
d) fructose and glucose
a) Glucose & Galactose
- Which of the following is not a disaccharide?
a) Sucrose
b) Maltose
c) Lactose
d) Galactose
d) Galactose
- Which of the following will not be reactive towards
seliwanoff reagent?
a) Maltose
b) Inulin
c) Fructose
d) Sucrose
a) Maltose
- Which of the following carbohydrate do not have any
essential nutritional value?
a) Sucrose
b) Cellulose
c) Dextrin
d) Glycogen
c) Dextrin
- Which sugars are present in Sucrose?
a) Fructose and glucose
b) Glucose and glucose
c) Glucose and galatose
d) Fructose and galatose
a) Fructose and glucose
- Which catalyst is used for reaction of ethylene glycol
with acetic acid?
a) Amberlyst 36
b) Hydrogen peroxide
c) Potassium permanganate
d) Aluminium bromide
View Answer
a) Amberlyst 36
- Which of the following is the most convenient and
inexpensive method of formation of glycol?
a) Hydroxylation of alkene by Bayer’s reagent
b) From 1,2-dibromoethane
c) Oxidation of ethylene and using Ag as catalyst
d) Ethylene treatment with HOCl
a) Hydroxylation of alkene by Bayer’s reagent
- Criegee oxidation of glycol should be performed in
which type of medium?
a) Hydrous
b) Anhydrous
c) Acidic
d) Basic
b) Anhydrous
- What happens when glycol reacts with lead
tetraacetate?
a) No reaction
b) Ketones will be formed
c) Aldehyde will not be formed
d) Monohydric alcohols will be formed
b) Ketones will be formed
- Which of the following is not a method of preparation
of glycol?
a) Shell’s omega method
b) From carbon monoxide
c) From Dimethyl oxalate
d) From nitrogen
d) From nitrogen
- Which of the following statement is not true about
criegee oxidation?
a) The oxidative cleavage of an alpha,beta-diol using lead
tetraacetate to give the corresponding carbonyl
compounds
b) It is analogous but milder than the Malaprade reaction
c) This oxidation was discovered by Rudolf Criegee and
coworkers and first reported in 1931
d) Rate of reaction do not depend upon stereochemistry of
glycol
d) Rate of reaction do not depend upon stereochemistry of
glycol
- What is the intermediate form in the mechanism of the
lead acetate and glycol?
a) Three membered cyclic ring
b) Four membered cyclic ring
c) Five membered cyclic ring
b) Four membered cyclic ring
- What is the name of the reaction when lead
tetraacetate is used cleave a carbon-carbon bond in a
glycol?
a) Criegee oxidation
b) Swern oxidation
c) Baeyer-Villiger Oxidation
d) Jones oxidation
a) Criegee oxidation
- What is the name of the process of formation of glycerol
via formation of allyl chloride?
a) Epichlorohydrine
b) Acrolein
c) Propylene oxide
d) Chloroform process
a) Epichlorohydrine
- Glycerol can be formed through digestion of which of
the following?
a) galactose
b) fats
c) glucose
d) sucrose
b) fats
- What happens when glycol reacts with periodic acid?
a) No reaction
b) Ketones will be formed
c) Aldehyde will not be formed
d) Monohydric alcohols will be formed
b) Ketones will be formed
- Ethylene glycol on treatment with phosphorus tri
iodide yields
a) ethyl iodide
b) ethylene di-iodide
c) ethylene
d) ethane
b) ethylene di-iodide
- Fatty acids and glycerol (C3H8O3) are produced after
hydrolysis of which of the following?
a) amino acids
b) fats
c) starch
d) cellulose
b) fats
- Which of the following is not the step for the isolation of
glycerine form spent lye?
a) Brine Solution Preparation
b) Saponification and salting
c) Zone distillation
d) Glycerin Recovery from Spent Soap Lye
c) Zone distillation
- Why synthetic production of glycerol is not
commercially successful?
a) Because process is expensive
b) Because no marketing demands
c) Because process is hazardous
d) Because of the large-scale production of biodiesel from
fats
c) Because process is hazardous
- What will be the product for the reaction of catalytic
hydrogenation of glycerol?
a) Glycerol carbonate
b) Epichlorohydrine
c) Propylene glycol
d) Ethylene glycol
c) Propylene glycol
- What will be product of the reaction if lead tetraacetate
and glycerol will react?
a) Glycerol carbonate
b) Ethylene glycol
c) Formic acid
d) Formaldehyde and formic acid
d) Formaldehyde and formic acid
- What will be the product for when glycerol is heated
with hydriodic acid?
a) Glycerol carbonate
b) Epichlorohydrine
c) Ethylene glycol
d) Isopropyl iodide
d) Isopropyl iodide
- Primary alcohol is gently heated to produce aldehyde in
presence of acidified solution of which of the following
compound?
a) hydroxide
b) dichromate
c) ethanol
d) ethanal
b) dichromate
- What will happen when glycerol is added into acid?
a) Esterification
b) Alcoholysis
c) Transesterification
d) No reaction will occur
a) Esterification