set 3 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on organic chemistry topic of general science mcq
(a) ester
(b) aldehydic
(c) ketonic
(d) carboxylic
The correct answers to the above question in:
Answer: (a)
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Question : 1
Hydrogenation of oils involves
- saturation of unsaturated fatty acids
- reaction with hydrogen in presence of nickel
- conversion into saturated fatty acids
- driving off the impurities in oil by hydrogen gas
a) 2, 3 and 4
b) 1, 2 and 3
c) 1, 2 and 4
d) 1, 3 and 4
Answer »Answer: (b)
Oils (generally liquid) are glycerides with a larger proportion of unsaturated fatty acids than fats (generally solid or semisolid).
Hence oils, when treated with hydrogen in presence of finely divided nickel as a catalyst, add hydrogen across the carbon-carbon double bonds of the unsaturated acid components to form saturated glycerides which are solid at room temperature.
Question : 2
General formula of alkyne is
a) CnH2n–2
b) CnH2n
c) CnH2n+2
d) CnHn
Answer »Answer: (a)
Question : 3
Addition of ethylene dibromide to petrol
a) helps elimination of lead oxide
b) removes the sulphur compound in petrol
c) increases the octane number of fuel
d) serves as a substitute of tetraethyl lead
Answer »Answer: (d)
Question : 4
Which one of the following is the correct sequence in increasing order of molecular weights of the hydrocarbons?
a) Propane, butane, ethane and methane
b) Butane, ethane, propane and methane
c) Methane, ethane, propane and butane
d) Butane, propane, ethane and methane
Answer »Answer: (c)
Question : 5
On the basis of following features identify the correct option A. Drinks containing ethanol B. These drinks are major source of income to government
a) Soft drinks
b) Carbonated beverages
c) Alcoholic beverages
d) Rectified spirit
Answer »Answer: (c)
Question : 6
Isomers of a substance must have the same
a) chemical properties
b) physical properties
c) structural formula
d) molecular formula
Answer »Answer: (d)
Organic compounds having same molecular formula but differ from each other in physical properties or chemical properties or both are known as isomers.
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