Carbon and its Compounds

Q1: The isomeric pair is

• Ethane and propane
• Propane and butane
• Ethane and ethane
• Butane and 2-methylpropane

Q2: Which of the given is used to oxidize ethanol to ethanoic acid?

• Alkaline KMnO₄
• Conc. H₂SO₄
• Acidified K₂Cr₂O₇
• All of these

Q3: Which is a denatured spirit?

• Ethanol only
• Ethanol and methanol (50%)
• Ethanol and methanol (5%)
• Methanol only

Q4: The isomeric pair is

• ethane and propane
• propane and butane
• ethane and ethane
• butane and 2-methyl propane

Q5: The by-product of soap is

• Isoprene
• Glycerol
• Butene
• Ethylene glycol

Q6: Covalent compounds

• Have high melting and boiling point
• Are mostly soluble in water
• Are formed between atoms of metals and non-metals
• Are formed by the sharing of electrons in the bonding atoms

Q7: Vinegar is a solution of

• 30% – 40% acetic acid in alcohol
• 5% – 8% acetic acid in alcohol
• 5% – 8% acetic acid in water
• 15% -20% acetic acid in water

Q8: Which of the given can be used for the denaturation of ethyl alcohol?

• Methyl alcohol
• Pyridines
• Copper sulphate
• All of these

Q9: Soaps are formed by saponification of

• Alcohols
• Glycosides
• Simple esters
• Carboxylic acids

Q10: Carbon exists in the atmosphere in the form of

• Only carbon monoxide
• Carbon monoxide in traces and carbon dioxide
• Only carbon dioxide
• Coal

Q11: Which of the following statements are usually correct for carbon compounds? These a. Are good conductors of electricity. b. Are poor conductors of electricity. c. Have strong forces of attraction between their molecules. d. Do not have strong forces of attraction between their molecules.

• (A) & (C)
• (B) & (C)
• (A) & (D)
• (B) & (D)

Q12: A molecule of ammonia (NH₃) has

• Only single bonds
• Only double bonds
• Only triple bonds
• Two double bonds and one single bond

Q13: Two neighbours of homologous series differ by

• _CH
• _CH₂
• _CH₃
• _CH₄

Q14: Which one of the given is an unsaturated hydrocarbon?

• Acetylene
• Butane
• Propane
• Decane

Q15: Which of the given is an odd compound?

• Ethene
• Ethane
• Propene
• Acetylene

Q16: Which of the given represents a saponification reaction?

• CH₃COONa + NaOH + CaO → CH₄ + Na₂CO₃
• CH₃COOH + C₂H₅ + H₂SO₄ → CH₃COOC₂H₅ + H₂O
• 2CH₃COOH + 2Na → 2CH₃COONa + H₂
• CH₃COOC₂H₅ + NaOH → CH₃COONa + C₂H₅OH

Q17: Vinegar is a solution of

• 50% – 60% acetic acid in alcohol
• 5% – 8% acetic acid in alcohol
• 5% – 8% acetic acid in water
• 50% – 60% acetic acid in water

Q18: Ethanol reacts with sodium and forms two products. These are

• Sodium ethanoate and hydrogen
• Sodium ethanoate and oxygen
• Sodium ethoxide and hydrogen
• Sodium ethoxide and oxygen

Q19: How many carbon atoms are present in one molecule of ethanol?

• One
• Two
• Three
• Four

Q20: How many carbon atoms are present in one molecule of ethanoic acid?

• One
• Two
• Three
• Four

Q21: How many single bonds are present in methane?

• Four
• Five
• Six
• Three

Q22: Which of the given has a triple bond?

• Hydrogen molecule
• Oxygen molecule
• Nitrogen molecule
• Ammonia molecule

Q23: Which allotrope of carbon is in the form of the geodesic globe?

• Graphite
• Diamond
• Fullerene
• Carbon nanotube

Q24: Which of the given is a noble gas?

• Carbon
• Argon
• Nitrogen
• Hydrogen

Q25: The heteroatoms present in CH₃─CH₂─O─CH₂─CH₂Cl are: A Oxygen B Carbon C Hydrogen D Chlorine Which of the following pairs are heteroatoms?

• A & B
• B & C
• C & D
• A & D

Q26: The name of the compound CH₃─CH₂─CHO is:

• Propanal
• Propanone
• Ethanol
• Ethanal

Q27: Major constituent of LPG is:

• Ethene
• Butane
• Propane
• Pentane

Q28: Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g. hydrogen. After the formation of four bonds, carbon attains the electronic configuration of

• Helium
• Neon
• Argon
• Krypton

Q29: Mineral acids are stronger acids than carboxylic acids because A. Mineral acids are completely ionised B. Carboxylic acids are completely ionised C. Mineral acids are partially ionised D. Carboxylic acids are partially ionised

• (A) & (D)
• (B) & (C)
• (A) & (B)
• (C) & (D)

Q30: Butanone is a four-carbon compound with the functional group ______

• Carboxylic acid
• Aldehyde
• Ketone
• Alcohol

Q31: Solubility of alcohol in water is due to

• low density of alcohol
• volatile nature of alcohol
• ionisation
• hydrogen bonding

Q32: A soap molecule has a

• hydrophobic head and hydrophobic tail
• hydrophobic head and hydrophilic tail
• hydrophilic head and hydrophilic tail
• hydrophilic head and hydrophobic tail

Q33: I.U.P.A.C. name of acetaldehyde is:

• Ethanol
• Ethanal
• Methanol
• Methanal

Q34: In diamond, each carbon atom is bonded to four other carbon atoms to form

• a hexagonal array
• a rigid three-dimensional structure
• a structure in the shape of a football
• a structure of a ring

Q35: Butanone is a four-carbon compound with the functional group ______

• Carboxylic acid
• Aldehyde
• Ketone
• Alcohol

Q36: The chemical formulae of propane is :

• CH4CH4
• C3H8C3H8
• C4H10C4H10
• C2H6C2H6

Q37: The first member of the alkyne homologous series is

• propyne
• ethyne
• methane
• ethene

Q38: Butanone is a four-carbon compound with the functional group:

• carboxylic acid
• aldehyde
• ketone
• alcohol

Q39: Ethane, with the molecular formula C2H6C2H6 has :

• 6 covalent bonds
• 7 covalent bonds
• 8 covalent bonds
• 9 covalent bonds.

Q40: Give the IUPAC name of CH3COOC2H5.

• Ethyl ethanoic acid
• Butanoate
• Ethyl ethanoate
• Etyl methyl carboxylic acid

Q41: A hydrocarbon has four carbon atoms. Give its molecular formula if it is an alkene.

• C4H10
• C4H8
• C4H6
• C4H4

Q42: Which of the following belongs to homologous series of alkynes? C6H6, C2H6, C2H4, C3H4.

• C6H6
• C2H4
• C2H6
• C3H4

Q43: The allotrope of carbon which is a good conductor of heat and electricity is

• diamond
• graphite
• charcoal
• none of these

Q44: Graphite is used as a lubricant in machines because

• it is a good conductor of electricity.
• it has a high melting point and slippery layers.
• its density ranges from 1.9 to 2.3 g/cm3g/cm3.
• it is strong and soft.

Q45: 100% pure ethanol is called

• Rectified spirit
• Absolute alcohol
• Denatured alcohol
• Power alcohol

Q46: A functional group mainly determines the

• Physical properties
• Chemical properties
• Both
• None of these

Q47: Identify ‘A’ in the following reaction: CH₃COOH + Na₂CO₃ → A + CO2 + H₂O

• CH₃COONa
• CH₂(Na)COOH
• NaOH
• NaHCO₃

Q48: Addition reactions are undergone by

• saturated hydrocarbons (alkanes)
• only alkenes
• only alkynes
• both alkenes and alkynes

Q49: Name the functional group present in CH3COCH3.

• Alcohol
• Carboxylic acid
• Ketone
• Aldehyde

Q50: Which of the following will give a pleasant smell of ester when heated with ethanol and a small quantity of sulphuric acid?

• CH₃COOH
• CH₃CH2OH
• CH₃OH
• CH₃CHO

Q51: Ethanol on complete oxidation gives

• acetic acid/ethanoic acid
• CO₂ and water
• ethanal
• acetone/ethanone

Q52: The isomeric pair is

• Ethane and propane
• Propane and butane
• Ethane and ethane
• Butane and 2-methylpropane

Q53: Ethanol reacts with Na metal to form

• CH₃ONa+H₂CH3ONa+H₂
• C₂H5ONa+H₂C2H5ONa+H₂
• CH₃COONa+H₂CH3COONa+H₂
• CH₃COOH+H₂OCH3COOH+H₂O