Q.1 Which of the following is the simplest hydrocarbon?
Ethane
Methane
Propane
Butane
Explanation - Methane (CH4) is the simplest hydrocarbon with only one carbon atom bonded to four hydrogen atoms.
Correct answer is: Methane
Q.2 What is the functional group present in alcohols?
-OH
-COOH
-NH2
-CHO
Explanation - Alcohols contain the hydroxyl group (-OH) attached to a carbon atom.
Correct answer is: -OH
Q.3 Which of the following is an aromatic hydrocarbon?
Methane
Benzene
Ethene
Butane
Explanation - Benzene (C6H6) is the simplest aromatic hydrocarbon with a cyclic structure and delocalized electrons.
Correct answer is: Benzene
Q.4 The IUPAC name of CH3-CH2-CH3 is:
Ethane
Methane
Propane
Butane
Explanation - The compound has three carbon atoms in a straight chain, hence it is propane.
Correct answer is: Propane
Q.5 Which type of bond is present in alkenes?
Single bond only
Double bond
Triple bond
Ionic bond
Explanation - Alkenes are unsaturated hydrocarbons that contain at least one double bond between carbon atoms.
Correct answer is: Double bond
Q.6 Which compound is a carboxylic acid?
CH3OH
CH3CHO
CH3COOH
CH4
Explanation - CH3COOH (acetic acid) is a carboxylic acid as it contains the -COOH group.
Correct answer is: CH3COOH
Q.7 What is the general formula of alkanes?
CnH2n
CnH2n+2
CnH2n-2
CnHn
Explanation - Alkanes are saturated hydrocarbons with the general formula CnH2n+2.
Correct answer is: CnH2n+2
Q.8 The functional group in aldehydes is:
-OH
-NH2
-CHO
-COOH
Explanation - Aldehydes are characterized by the presence of the formyl group (-CHO).
Correct answer is: -CHO
Q.9 Which compound is an example of an amine?
CH3CH2NH2
CH3CH2OH
CH3CHO
CH3COOH
Explanation - CH3CH2NH2 is ethylamine, an organic compound with the amino (-NH2) group.
Correct answer is: CH3CH2NH2
Q.10 Which of the following reactions is used to test for unsaturation in hydrocarbons?
Reaction with NaOH
Reaction with Br2 water
Reaction with HCl
Reaction with KMnO4
Explanation - Unsaturated hydrocarbons decolorize bromine water due to addition across double or triple bonds.
Correct answer is: Reaction with Br2 water
Q.11 The process of converting ethanol into ethanoic acid involves:
Reduction
Oxidation
Hydrogenation
Neutralization
Explanation - Ethanol is oxidized to ethanoic acid (acetic acid) by oxidizing agents like KMnO4 or K2Cr2O7.
Correct answer is: Oxidation
Q.12 What is the IUPAC name of CH3-CHO?
Methanal
Ethanol
Ethanal
Methanoic acid
Explanation - CH3-CHO contains two carbon atoms and the -CHO group, making it ethanal.
Correct answer is: Ethanal
Q.13 Which of the following is a secondary alcohol?
CH3OH
CH3CH2OH
CH3CHOHCH3
CH3CH2CH2OH
Explanation - CH3CHOHCH3 is isopropanol, a secondary alcohol where the -OH group is attached to a carbon bonded to two other carbons.
Correct answer is: CH3CHOHCH3
Q.14 The polymer formed from ethene is:
Polythene
Polyvinyl chloride
Teflon
Nylon
Explanation - Ethene polymerizes to form polythene, a common plastic material.
Correct answer is: Polythene
Q.15 Which type of isomerism is shown by butane (C4H10)?
Chain isomerism
Functional isomerism
Position isomerism
Geometrical isomerism
Explanation - Butane has two chain isomers: n-butane and isobutane (methylpropane).
Correct answer is: Chain isomerism
Q.16 Which of the following is a ketone?
CH3CHO
CH3COCH3
CH3COOH
CH3OH
Explanation - CH3COCH3 (acetone) is a ketone with the carbonyl group (-C=O) attached to two carbons.
Correct answer is: CH3COCH3
Q.17 What is the product when ethene reacts with hydrogen in the presence of a catalyst?
Ethane
Ethanol
Ethanoic acid
Ethyl chloride
Explanation - Ethene undergoes catalytic hydrogenation to form ethane.
Correct answer is: Ethane
Q.18 Which of the following has the highest boiling point?
Methane
Ethane
Ethanol
Ethene
Explanation - Ethanol has hydrogen bonding, leading to a much higher boiling point than hydrocarbons.
Correct answer is: Ethanol
Q.19 The IUPAC name of CH3-CH2-COOH is:
Ethanoic acid
Methanoic acid
Propanoic acid
Butanoic acid
Explanation - The compound has three carbon atoms and a -COOH group, hence propanoic acid.
Correct answer is: Propanoic acid
Q.20 Which organic compound is known as vinegar?
Methanol
Acetone
Ethanoic acid
Ethanol
Explanation - Vinegar is a dilute aqueous solution of ethanoic acid.
Correct answer is: Ethanoic acid
Q.21 Which test is used to identify phenol?
Tollen's test
Bromine water test
Iodoform test
FeCl3 test
Explanation - Phenols give a violet coloration with neutral FeCl3 solution due to complex formation.
Correct answer is: FeCl3 test
Q.22 Which of the following is an alkyne?
CH4
C2H2
C2H6
C3H8
Explanation - C2H2 (acetylene) is the simplest alkyne containing a triple bond.
Correct answer is: C2H2
Q.23 Which of these compounds is unsaturated?
Ethane
Propane
Butene
Methane
Explanation - Butene has a carbon–carbon double bond, making it an unsaturated hydrocarbon.
Correct answer is: Butene
Q.24 Which reagent is used to distinguish between aldehydes and ketones?
Benedict's solution
Conc. H2SO4
NaOH
HCl
Explanation - Aldehydes reduce Benedict’s solution to give a red precipitate, while ketones do not.
Correct answer is: Benedict's solution
Q.25 The compound CHCl3 is called:
Methanol
Chloroform
Carbon tetrachloride
Methanal
Explanation - CHCl3 is chloroform, a halogenated hydrocarbon once used as an anesthetic.
Correct answer is: Chloroform