Organic Chemistry Assertion Reason Questions for ICSE Chemistry Class 10. This Assertion (A) Reason (R) type Questions is very helpful for this year students.
Question No. 1 and 20 consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
a) Both A and R are true, and R is the correct explanation of A.
b) Both A and R are true, and R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true
Que 1) Assertion: Organic compound generally not dissolve in water but soluble in organic solvents.
Reason: Inorganic Compound generally dissolve in water but they can not dissolve in organic solvent
Que 2) Assertion: The general formula of alkenes is CnH2n.
Reason: The general formula of paraffins are CnH2n+1.
Que 3) Assertion: Carbon shows the property of catenation.
Reason: Carbon atom posses a unique property to link together to form very long chains.
Que 4) Assertion: Alkenes and Alkynes are the two types of saturated compounds.
Reason: The open chain compounds are divided into saturated compound and unsaturated compounds.
Que 5) Assertion: The compound cyclopentane comes under the category of alicyclic compounds.
Reason: The cyclopentane compound contains five carbon atoms and ten hydrogen atoms.
Que 6) Assertion: Generally unsaturated compounds undergo addition reaction.
Reason: The unsaturated compounds have presence of electrons in the double and triple bond.
Que 7) Assertion: Alkanes, alkenes and alkynes are the example of homologous series.
Reason: A homologous series is group of organic compounds having similar structure but different chemical properties.
Que 8) Assertion: Organic compound have low M.P. and B.P. and easily decompose on heating.
Reason: Inorganic compound have high M.P. and B.P. and not easily decompose on heating.
Que 9) Assertion: According to IUPACorganic compound consist of two parts suffix and prefix.
Reason: Root word depend upon the number of carbon atom present in the longest chain.
Que 10) Assertion: Ethane is prepared by passing ethanol vapours through a tube containing alumina
Reason: Ethene is flammable gas and it is soluble in gas.
Que 11) Assertion: Diethyl ether and Methyl propyl ether are isomers of each other.
Reason: Compounds having molecular formula but different structural formula.
Que 12) Assertion: Methane, ethane, propane shows molar masses in increasing order 16, 30, 44 respectively.
Reason: Above compounds comes under homologous series.
Que 13) Assertion: Pentane and Neo-pentane are metamers of each other.
Reason: Metamerism is arises due to unequal distribution of alkyl groups on either side of the functional group in the molecules.
Que 14) Assertion: Shape of ethyne is linear and it shows triple covalent bond.
Reason: Ethyne is heavier than air and its boiling point is +75 degree Celsius.
Que 15) Assertion: Acetylene react vigorously with chlorine gas in the presence of sunlight.
Reason: Carbon tetrachloride yellow colour is disappears when bromine adds in it.
Que 16) Assertion: Ethyl alcohol is called as spirit of wine and it is obtained from starchy grain.
Reason: Cracking of petroleum is a source of ethane, which is used in preparation of alcohol.
Que 17) Assertion: Glycerol contains four OH groups bonded to four different carbon atoms.
Reason: 1,2,3-propane triol is trihydric compound.
Que 18) Assertion: Carboxylic acid shows pungent smell.(smell of vinegar)
Reason: Carboxylic acid is not soluble in water, alcohol and ether.
Que 19) Assertion: Ethyl alcohol gives temporary relief from tiredness.
Reason: Ethyl alcohol affects the part of the brain which controls our muscular movements.
Que 20) Assertion: Ethene is used for ripening of fruits.
Reason: Ethanol is used to make polyethylene.
ANSWERS
1) B 6) A 11) A 16) B
2) C 7) C 12) A 17) D
3) A 8) B 13) D 18) C
4) D 9) D 14) C 19) A
5) B 10) C 15) B 20) C