Well structured WBBSE Class 10 Physical Science MCQ Questions Chapter 8.6 Organic Chemistry can serve as a valuable review tool before exams.
Organic Chemistry Class 10 WBBSE MCQ Questions
Question 1.
CnH2n + 2 is general formula of ________
(A) Alkenes
(B) Alkynes
(C) Alkanes
(D) Ring
Answer:
(C) Alkanes
Question 2.
Aliphatic hydrocarbons with double bond : ________
(A) are saturated
(B) generally add bromine
(C) belong to the acetylene family group
(D) belong to the paraffin
Answer:
(B) generally add bromine
Question3.
When sodium acetate is heated with soda lime, the reaction is called: ________
(A) Dehydration
(B) Decarboxylation
(C) Dehydrogenation
(D) Dehydrohalogenation
Answer:
(B) Decarboxylation
Question 4.
Ethylene can be prepared by reacting ethyl bromide with : ________
(A) Alcoholic KOH
(B) Amoniacal AgNO3
(C) Acidified KMnO4
(D) C and H2SO4
Answer:
(A) Alcoholic KOH
Question 5.
The product obtained when chloroform is treated with silver powder is: ________
Ethylene
ethane
Acetylene
Methane
Answer:
Acetylene
Question 6.
A metallic carbide on treatment with water gives a colourless gas which burns readily in air and gives a precipitate with ammoniacal silver nitrate. The gas is : ________
(A) Methane
(B) Ethane
(C) Ethylene
(D) Acetylene
Answer:
(D) Acetylene
Question 7.
A gas decolourises bromine in CCl2 and forms a precipitate with ammoniacal silver nitrate. The gas is :
(A) Acetylene
(B) Ethylene
(C) Methane
(D) Ethane
Answer:
(B) Ethylene
Question 8.
The LHCC bond angle in ethylene is : ________
(A) 90°
(B) 120°
(C) 109° 28’
(D) 180°
Answer:
(B) 120°
Question 9.
Saturated hydrocarbons mainly undergo : ________
(A) Addition reactions
(B) Substitution reactions
(C) Elimination reaction
(D) Polymerisation
Answer:
(B) Substitution reactions
Question 10
Which of the following bonds is strongest?
Answer:
(C)
Question 11.
The reaction
is called : ________
(A) Kolbe’s reaction
(B) Annizzaro’s reaction
(C) Sabatier and Senderen’s reaction
(D) Clemmensen reaction
Answer:
(C) Sabatier and senderen’s reaction
Question 12.
Both methane and ethane may be obtained in one step reaction from ________
(A) C2H4
(B) CH3I
(C) CH3OH
(D) C2H5OH
Answer:
(B) CH3I
Question 13.
Which of the following liberates methane on treatment with water ?
(A) Silicon carbide
(B) Calcium carbide
(C) Aluminium carbide
(D) Iron carbide
Answer:
(C) Aluminium carbide
Question 14.
On heating sodium acetate with sodium hydroxide, the gas evolved will be : ________
(A) Acetylene
(B) Ethane
(C) Methane
(D) Ethylene
Answer:
(C) Methane
Question 15.
A compound having a triple bond is more reactive because : ________
(A) there is a strain in the molecule
(B) valency of hydrogen is different
(C) electron density is higher
(D) none
Answer:
(C) electron density is higher.
Question 16.
Acidic hydrogen is present in : ________
(A) Ethyne
(B) Ehene
(C) Benzene
(D) Ethane
Answer:
(A) Ethyne
Question 17.
Final product of the oxidation of hydrocarbon is : ________
(A) CO2 and H2O
(B) Alcohol
(C) Acid
(D) Aldehyde
Answer:
(A) CO2 and H2O
Question 18.
General formula for alkenes is : ________
(A) CnH2n
(B) CnH2n+1
(C) CnH2n-1
(D) C2nH2n
Answer:
(A) CnH2n
Question 19.
Marsh gas mainly contains : ________
(A) H2S
(B) CO
(C) CH4
(D) C2H2
Answer:
(C) CH4
Question 20.
Which of the following gases is used in welding ?
(A) C2H4
(B) C2H2
(C) CH4
(D) C2H6
Answer:
(B) C2H2
Question 21.
Which hydrocarbon is used in making printer’s ink and paints ?
(A) CH4
(B) C2H6
(C) C2H4
(D) C2H2
Answer:
(A) CH4
Question 22.
The sugar which is stored in the liver to act as reserve food is : ________
(A) Glycogen
(B) Glucose
(C) Sucrose
(D) Fructose
Answer:
(A) Glycogen
Question 23.
Sweetest among all the sugar is : ________
(A) Fructose
(B) Glucose
(C) Sucrose
(D) Lactose
Answer:
(A) Fructose
Question 24.
The main structural feature of protein is : ________
(A) Ether linkage
(B) Peptide linkage
(C) Ester linkage
(D) All the above
Answer:
(B) Peptide linkage
Question 25.
Which of the following is protein ?
(A) Terry cotton
(B) Natural silk
(C) Nylon
(D) Rayon
Answer:
(B) Natural silk.
Question 26.
Which of the following contains nitrogen ?
(A) Fats
(B) Proteins
(C) Carbohydrate
(D) None
Answer:
(B) Proteins
Question 27.
Which of the following is an organic compound ?
(A) urea
(B) NaHCO3
(C) CO4
(D) NH4 CNS
Answer:
(A) urea
Question 28.
Organic compound are:________
(A) high melting
(B) low meffing
(C) soluble in water
(D) conducts electricity in molten state
Answer:
(B) low melting
Question 29.
Tetravalence of carbon is proposed by: ________
(A) Wohler
(B) Lavoisier
(C) Kekule
(D) Vant Hoff
Answer:
(C) Kekule
Question 30.
Tetrahedral model of carbon compounds proposed by: ________
(A) Kekule
(B) Rutherford
(C) Wohier
(D) Vant Hoff
Answer:
(D) Vont Hoff
Question 31.
The number of covalent bonds present in ethane is : ________
(A) 4
(B) 6
(C) 7
(D) 9
Answer:
(C) 7
Question 32.
Which molecule has tetrahedral geometry? ________
(A) methane
(B) ethylene
(C) acetylene
(D) carbon dioxide
Answer:
(A) methane
Question 33.
Which does not react with metallic sodium?
(A) methyl alcohol
(B) ethyl alcohol
(C) acetic acid
(D) dimethyl ether
Answer:
(D) Dmethyt ether
Question 34.
How many positional isomers are possible with the molecular formula C3H10?
(A) 1
(B) 2
(C) 3
(D) 4
Answer:
(C) 2
Question 35.
How many functional isomers are possible with molecular formula C3H8O?
(A) 1
(B) 3
(C) 2
(D) 4
Answer:
(C) 2
Question 36.
IUPAC name of CH3 CH2 CH2 OH is:
(A) propan-1-oI
(B) n-propanol
(C) isopropanol
(D) propyl alcohol
Answer:
(A) Propon-I-ol
Question 37.
IUPAC name of Formaldehyde Is:
(A) Butanal
(B) Propanal
(C) Ethanal
(D) Methanal
Answer:
(D) Methanal
Question 38.
The total number of different carbon chains that five carbon atoms form in alkane is:
(A) 5
(B) 4
(C) 3
(D) 2
Answer:
(C) 3
Question 39.
The IUPAC name of the hydrocarbon present in rectified spirit is :
(A) methanol
(B) ethanol
(C) trichioromethane
(D) ethanai
Answer:
(B) ethanol
Question 40.
Which of the following functional group is present in vinegar?
(A) -CHO
(B) C=O
(C) -COOH
(D) -OH
Answer:
(C) -COOH
Question 41.
Which of the following can damage optic nerve?
(A) acetic acid
(B) ethyl alcohol
(C) acetone
(D) methanol
Answer:
(D) methanol
Question 42.
Which one of the following is not a polymer?
(A) LPG
(B) Jute
(C) PVC
(D) PET
Answer:
(A) LPG
Question 43.
Urea was synthesized by wohier from ………
(A) ammonia and carbon monoxide
(B) ammonium cyanate
(C) ammonium thiocyanate
(D) ammonium chloride and CO2
Answer:
(B) ammonium cyanate
Question 44.
Identify the wrong statement
(A) Organic compounds have low m.p. and b.p.
(B) Organic Compounds are Soluble in solvent having high dielectric constant.
(C) Most organic compounds are do not conduct electricity
(D) Most of the organic compounds are liquid or gaseous under ordinary temperature and pressure.
Answer:
(b) Organic Compounds are soluble in solvent having high dielectric constant.
Question 45.
Organic compounds are generally
(A) Soluble in water
(B) insoluble in water
(C) ionize in water
(D) hydrolyze in water
Answer:
(B) insoluble in water
Question 46.
The biggest source of methane is …………….
(A) Synthesis gas
(B) natural gas
(C) nerve gas
(D) LPG
Answer:
(B) natural gas
Question 47.
Chlorine reacts with saturated hydrocarbons at room temperature in the
(A) presence of sunlight
(B) absence of sunlight
(C) presence of moisture
(D) presence of an acid catalyst
Answer:
(A) presence of sunlight
Fill in the Blanks:
1. …………. is the abbreviation of polyvinyl chloride.
Answer:
PVC.
2. The monomer of …………. is tetrafluoroethene.
Answer:
teflon.
3. …………. is a large molecule made up of many similar units of small molecules.
Answer:
Polymer.
4. The compound bearing the monovalent functional group – CHO are ………….
Answer:
aldehydes.
5. Alkynes are hydrocarbons where at least two carbon atoms combine with a …………. bond.
Answer:
triple.
6. The function group of organic acid is ………….
Answer:
– COOH
7. The functional group of …………. is -NH.
Answer:
amines.
8. Hydrocarbons in which at least two carbon atoms join with a double bond are called ………….
Answer:
alkenes.
9. Catenation is the property where a large number of …………. atoms link together to form large organic molecules.
Answer:
carbon.
10. Proteins contain various kinds of …………. acids.
Answer:
amino
11. RNA is the abbreviation for…………. acid.
Answer:
ribonucleic.
12. …………. is a complex organic compound responsible for reproduction and maintaining heredity.
Answer:
Gene.
13. …………. and proteins are the polymerisation products of amino acids.
Answer:
Polypeptides.
14. Amino acids are the end products of the digestion of ………….
Answer:
proteins.
15. Polypeptide chains are the chains of ………….
Answer:
polymers of amino acids.
16. Sucrose on hydrolysis give one …………. and one fructose molecule.
Answer:
glucose.
17. Starch is …………. saccharide.
Answer:
poly.
18. Carbohydrates containing a keto group are called ………….
Answer:
ketoses.
19. Vitamin C is soluble in ………….
Answer:
water.
20. Globular proteins me …………. in water.
Answer:
soluble.
21. The carbon chains in alkenes are ………….
Answer: zig-zag.
22. Hydrocarbons are more soluble in …………. solvents.
Answer:
non-polar.
23. Ethane on combustion produces ………….
Answer:
Carbon dioxide and water.
24. AlC evolves …………. when treated with water.
Answer:
methane.
25. Halogenation of alkanes does not occur in ………………….
Answer: dark.
26. Wurtz reaction is used for the preparation of ………………….
Answer:
alkanes.
27. Melting point of organic compounds are …………………. than of inorganiccompounds.
Answer:
lower.
28. Organic compounds are …………………. and inorganic compounds are…………………..
Answer:
covalent, electrovalent
29. Kekule proposed C is …………………. and Vant Hoff proves C is ………………….
Answer:
tetravalent, covalent
30. The simplest alkane is …………………..
Answer:
methane
31………………… is the active ingredient of all alcoholic drinks.
Answer:
Ethanol
32. The first organic compound synthesized in the laboratory is ……..
Answer:
urea
33. H – C – H bond angle is methane is …………….
Answer:
109°28′
34. The existence of huge number of carbon compounds are due to two properties of carbon : tetravalency and ……………
Answer: catenation
35. n-propyl alcohol and iso-propyl alcohol exhibit…………… isomerism.
Answer:
positional
36. Methane, ethane and propane are the first three members of a ………….. series.
Answer:
homologous
37. …………. is the main constituent of CNG.
Answer:
Methane
38. Ethanoic acid is commonly known as…………..acid.
Answer:
acetic
39. IUPAC name of formic acid is …………
Answer:
methanoic acid
State whether the following statement is True or False : VSA
1. One must not drive a car after consuming alcohol._________________
Answer:
True
2. Denatured spirit cannot be consumed orally._____________________
Answer:
True
3. ‘Carbon’ comes from the Latin word ‘carbo’ meaning coal.
Answer:
True
4. Methane is the main constituent of marsh gas.
Answer:
True
5. Industrially ethane is produced by catalytic cracking of petroleum.
Answer:
True
6. Burning of methane in air is an exothermic reaction.
Answer:
True
7. PVC is highly fire resistant,
Answer:
True
8. Ethanol is used as a solvent in laboratory.
Answer:
True
9. Ethanol damages the optic nerve and may cause blindness.
Answer:
False
10. Teflon is hydrophobic and high heat resistant.
Answer:
True