Carbon exists in the atmosphere in the form of
carbon monoxide only
carbon monoxide in traces and carbon dioxide
carbon dioxide only
coal
Which of the following statements are usually correct for carbon compounds?
(i) are good conductors of electricity
(ii) are poor conductors of electricity
(iii) have strong forces of attraction between their molecules
(iv) do not have strong forces of attraction between their molecules
(i) and (iii)
(ii) and (iii)
(i) and (iv)
(ii) and (iv)
A molecule of ammonia (NH₃) has
only single bonds
only double bonds
only triple bonds
two double bonds and one single bond
Buckminsterfullerene is an allotropic form of
phosphorus
sulphur
carbon
tin
Which of the following are correct structural isomers of butane?
(i) and (iii)
(ii) and (iv)
(i) and (ii)
(iii) and (iv)
In the reaction CH₃–CH₂–OH → CH₃–COOH (Alkaline KMnO₄ + Heat), alkaline KMnO₄ acts as
reducing agent
oxidising agent
catalyst
dehydrating agent
Oils treated with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of
Addition reaction
Substitution reaction
Displacement reaction
Oxidation reaction
In which of the following compounds, —OH is the functional group?
Butanone
Butanol
Butanoic acid
Butanal
The soap molecule has
a hydrophilic head and a hydrophobic tail
a hydrophobic head and a hydrophilic tail
a hydrophobic head and a hydrophobic tail
a hydrophilic head and a hydrophilic tail
Which of the following is the correct representation of electron dot structure of nitrogen?
N : N
:N : N:
N : : N
:N ≡ N:
Structural formula of ethyne is
H–C≡C–H
H₃–C≡C–H
C=C
H–C=C–H
Identify the unsaturated compounds from the following:
(i) Propane
(ii) Propene
(iii) Propyne
(iv) Chloropropane
(i) and (ii)
(ii) and (iv)
(iii) and (iv)
(ii) and (iii)
Chlorine reacts with saturated hydrocarbons at room temperature in the
absence of sunlight
presence of sunlight
presence of water
presence of hydrochloric acid
In the soap micelles
the ionic end of soap is on the surface of the cluster, carbon chain in interior
ionic end is in interior, carbon chain out
both ionic end and carbon chain are in the interior
both ionic end and carbon chain are on the exterior
Pentas has molecular formula C₅H₁₂. It has
5 covalent bonds
12 covalent bonds
16 covalent bonds
17 covalent bonds
Structural formula of benzene is
structure a
structure b
structure c
structure d
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
The correct structural formula of butanoic acid is
structure a
structure b
structure c
structure d
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
Mineral acids are stronger acids than carboxylic acids because
(i) mineral acids are completely ionised
(ii) carboxylic acids are completely ionised
(iii) mineral acids are partially ionised
(iv) carboxylic acids are partially ionised
(i) and (iv)
(ii) and (iii)
(i) and (ii)
(iii) and (iv)
Carbon forms four covalent bonds by sharing electrons with four univalent atoms. After these four bonds, carbon attains the electronic configuration of
helium
neon
argon
krypton
The correct electron dot structure of a water molecule is
H·Ö·H
H:Ö:H
H:Ö:H
H·O·H
Which of the following is not a straight-chain hydrocarbon?
structure a
structure b
structure c
structure d
Which among the following are unsaturated hydrocarbons?
(i) H₃C—CH₂—CH₂—CH₃
(ii) H₃C—C≡C—CH₃
(iii) H₃C—CH—CH₃
(iv) H₃C—C≡CH
(i) and (ii)
(ii) and (iii)
(ii) and (iv)
(iii) and (iv)
Which of the following does not belong to the same homologous series?
CH₄
C₂H₆
C₃H₈
C₄H₈
The name of the compound CH₃—CH₂—CHO is
Propanal
Propanone
Ethanol
Ethanal
The heteroatoms present in CH₃—CH₂—O—CH₂—CH₂Cl are
(i) oxygen
(ii) carbon
(iii) hydrogen
(iv) chlorine
(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(i) and (iv)
Which of the following represents saponification reaction?
reaction a
reaction b
reaction c
reaction d
The first member of alkyne homologous series is
ethyne
ethene
propyne
methane