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Quiz 76
Mdcat-past-papers - UHS Quiz
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Board: UHS |
1501. Which one of the following groups is indicated when HCl is formed by reaction of ethanol with phosphorus pentachloride?
Amino group
Hydroxyl group
Halide group
Hydride group
1502. Which one of the following is not able to denature ethanol?
Methanol
Lactic acid
Pyridine
Acetone
1503. How will you distinguish between methanol and ethanol?
By Lucas test
By silver mirror test
By oxidation
By iodoform test
1504. To produce absolute alcohol (100%) from rectified spirit (95.6% alcohol), the remaining 4.4% water must be removed by a dry agent such as:
Calcium oxide
Calcium chloride
Calcium carbonate
Carbon monoxide
1505. Which one of the following is an indication of positive iodoform test?
Formation of H₂O
Release of H₂ gas
Brick red precipitate
Yellow crystal
1506. What is the common name of 1,2,3-propanetriol?
Butyl alcohol
Glycol
Glycerol
Propyl alcohol
1507. Dehydration of alcohol gives which of the following product in the presence of H₂SO₄ at 140°C?
Acetaldehyde
Ethyl acetate
Diethyl ether
Ethyl chloride
1508. Complete oxidation of alcohol gives which of the following?
Aldehyde
Carboxylic acid
Alkane
Peptones
1509. Which one of the following compounds is a ketone?
CH₃-O-CH₂-CH₃
CH₃-CO-CH₂-CH₃
CH₃COCOOH
CH₃-CH₂-CHO
1510. When CH₃-CH₂-OH is oxidized in the presence of K₂Cr₂O₇ and H₂SO₄, the product formed is:
CH₃-COOH
H-COOH
CH₃-C-OCH₃
CH₃-C-OCH₃
1511. Both aldehydes and ketones are planar to the plane of carbonyl group. Which one of the following bonds is distorted towards the oxygen atom?
π bonds of C and O
Sigma bond of C and H
Sigma bond of C & O
Sigma bond of C and C
1512. Which one of the following is the IUPAC name of the HCHO?
Propionaldehyde
Methane
Acetaldehyde
Methanal
1513. Why is it necessary to distill aldehyde formed from oxidation of primary alcohol through acidified potassium dichromate(VI) solution or acidified sodium dichromate(VI) solution?
Aldehyde formed may be oxidised further to carboxylic acid concerned
Aldehyde formed is unstable and further decomposes back to original precursor, i.e. primary alcohol
Aldehyde may be oxidised further to a ketone
Aldehyde formed may react with primary alcohol, the original reactant
1514. Ketones can be made by oxidation of:
Secondary alcohols
Tertiary alcohols
Aldehydes
Primary alcohols
1515. Which of the following is the correct name of CH₃CH₂CH₂COCH₂CHO?
3-Oxo-hexanal
Hexanal
Butanal
Propanal
1516. Which is the most suitable reagent for the conversion of R-CH₂OH → RCHO?
KMnO₄/NaOH
K₂Cr₂O₇/H₂SO₄ (Conc.)
CrO₃
CrO₃/H₂SO₄ (Conc.)
1517. What is the IUPAC name of diisopropyl ketone?
1,3-Diisopropylpropane-2-one
2,4-Dimethylpentane-3-one
2,4-Dimethylpentane-2-one
1,3-Dimethylpropane-2-one
1518. C₆H₁₂O is the general formula of:
Ether
Carboxylic acid
Ketones
Carbolic acid
1519. Consider the following reaction: R–CHO + 2[Ag(NH₃)₂]OH → R–COOH + 2Ag + H₂O + 2NH₃
Fehling test
Ninhydrin test
Benedict's test
Tollen's test
1520. A student mixed ethyl alcohol with small amount of sodium dichromate and added it to the hot solution of dilute sulphuric acid. A vigorous reaction took place. He distilled the product:
Acetone
Acetic acid
Dimethyl ether
Acetaldehyde
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