Class 11 Chem - Hydrocarbons - MERIT YARD
Class 11 Chem - Hydrocarbons - MERIT YARD
1 / 40What is the exact chemical formula of the simplest saturated hydrocarbon (Methane)?
A) \( CH_4 \)
B) \( C_2H_6 \)
C) \( C_2H_4 \)
D) \( CH_3 \)
2 / 40What is the standard general formula for saturated open-chain Alkanes?
A) \( C_n H_{2n} \)
B) \( C_n H_{2n+2} \)
C) \( C_n H_{2n-2} \)
D) \( C_n H_n \)
3 / 40Which of the following alkanes contains exactly two carbon atoms?
A) Methane
B) Propane
C) Ethane
D) Butane
4 / 40Wurtz reaction is primarily used for the preparation of higher alkanes using which active metal?
A) Magnesium (Mg)
B) Calcium (Ca)
C) Iron (Fe)
D) Sodium (Na)
5 / 40Which specific solvent is strictly required to carry out the Wurtz reaction?
A) Dry ether
B) Aqueous alcohol
C) Water
D) Concentrated acid
6 / 40The major component of natural gas (CNG) and biogas is:
A) Butane
B) Methane
C) Propane
D) Ethane
7 / 40What is the standard general formula for open-chain Alkenes?
A) \( C_n H_{2n+2} \)
B) \( C_n H_{2n-2} \)
C) \( C_n H_{2n} \)
D) \( C_n H_{n} \)
8 / 40What is the chemical formula of the simplest alkene (Ethene)?
A) \( CH_2 \)
B) \( C_3H_6 \)
C) \( C_2H_2 \)
D) \( C_2H_4 \)
9 / 40What is the exact state of hybridization of the carbon atoms involved in a \( C=C \) double bond?
A) \( sp^2 \)
B) \( sp^3 \)
C) \( sp \)
D) \( sp^3d \)
10 / 40The addition of hydrogen halides \( (HX) \) to an unsymmetrical alkene follows which famous rule?
A) Hund's rule
B) Markovnikov's rule
C) Saytzeff's rule
D) Pauli's exclusion principle
11 / 40Anti-Markovnikov addition (Peroxide effect / Kharasch effect) is strictly observed only with which acid?
A) \( HCl \)
B) \( HI \)
C) \( HBr \)
D) \( HF \)
12 / 40Which of the following catalysts is primarily used in the hydrogenation of alkenes to alkanes?
A) Conc. \( H_2SO_4 \)
B) \( AlCl_3 \)
C) Iron (Fe)
D) finely divided Ni, Pd, or Pt
13 / 40What is the chemical composition of Baeyer's reagent (used to test unsaturation)?
A) Cold dilute alkaline \( KMnO_4 \)
B) Hot acidic \( KMnO_4 \)
C) Aqueous Bromine water
D) Ammoniacal \( AgNO_3 \)
14 / 40The original color of Baeyer's reagent, which gets decolorized by alkenes/alkynes, is:
A) Colorless
B) Purple/Pink
C) Blue
D) Orange
15 / 40The complete catalytic hydrogenation of Ethyne
\( (HC \equiv CH) \) strictly yields:
A) Methane
B) Ethene
C) Ethane
D) Benzene
16 / 40What is the standard general formula for open-chain Alkynes?
A) \( C_n H_{2n+2} \)
B) \( C_n H_{2n} \)
C) \( C_n H_{n} \)
D) \( C_n H_{2n-2} \)
17 / 40What is the exact state of hybridization of the carbon atoms involved in a \( C \equiv C \) triple bond?
A) \( sp \)
B) \( sp^2 \)
C) \( sp^3 \)
D) \( dsp^2 \)
18 / 40The popular common name for the simplest alkyne, Ethyne
\( (C_2H_2) \), is:
A) Olefin
B) Acetylene
C) Ethylene
D) Marsh gas
19 / 40Due to high s-character (50%), which of the following hydrocarbons is scientifically the most acidic?
A) Alkanes
B) Alkenes
C) Terminal Alkynes
D) Benzene
20 / 40Calcium carbide \( (CaC_2) \) on reaction with water (hydrolysis) strictly produces which gas?
A) Methane
B) Ethene
C) Carbon dioxide
D) Ethyne (Acetylene)
21 / 40How many pi \( (\pi) \) bonds are strictly present in one molecule of Ethyne \( (HC \equiv CH) \)?
A) 2
B) 1
C) 0
D) 3
22 / 40What is the exact molecular formula of the simplest aromatic hydrocarbon, Benzene?
A) \( C_6H_{12} \)
B) \( C_6H_6 \)
C) \( C_6H_{14} \)
D) \( C_5H_5 \)
23 / 40According to Huckel's rule, a cyclic, planar compound is aromatic if it contains:
A) \( 4n\pi \) electrons
B) \( 2n\pi \) electrons
C) \( (4n + 2)\pi \) electrons
D) \( (n + 2)\pi \) electrons
24 / 40Which catalyst is strictly used in the electrophilic substitution (chlorination) of benzene?
A) Dilute \( HCl \)
B) Aqueous \( NaOH \)
C) Nickel (Ni)
D) Anhydrous \( AlCl_3 \)
25 / 40The reaction of benzene with an alkyl halide in the presence of anhydrous \( AlCl_3 \) is called:
A) Friedel-Crafts alkylation
B) Wurtz reaction
C) Friedel-Crafts acylation
D) Markovnikov addition
26 / 40The reaction of benzene with an acyl halide (like \( CH_3COCl \)) in the presence of anhydrous \( AlCl_3 \) is called:
A) Wurtz reaction
B) Friedel-Crafts acylation
C) Friedel-Crafts alkylation
D) Ozonolysis
27 / 40The "Nitrating mixture" used for the nitration of benzene strictly consists of:
A) Dil. \( HNO_3 \) + Dil. \( HCl \)
B) Conc. \( HNO_3 \) + Conc. \( HCl \)
C) Conc. \( HNO_3 \) + Conc. \( H_2SO_4 \)
D) Fuming \( HNO_3 \) only
28 / 40How many total sigma \( (\sigma) \) and pi \( (\pi) \) bonds are present in a Benzene molecule?
A) 6 sigma, 3 pi
B) 12 sigma, 6 pi
C) 6 sigma, 6 pi
D) 12 sigma, 3 pi
29 / 40What is the exact state of hybridization of every carbon atom present in Benzene?
A) \( sp^2 \)
B) \( sp^3 \)
C) \( sp \)
D) \( sp^3d \)
30 / 40Because of their low chemical reactivity, Alkanes are historically also known as:
A) Olefins
B) Paraffins
C) Acetylenes
D) Aromatics
31 / 40Because they form oily liquids with halogens, Alkenes are historically also known as:
A) Paraffins
B) Alcohols
C) Olefins
D) Esters
32 / 40Due to minimal torsional strain, the most stable conformation of Ethane is strictly the:
A) Eclipsed conformation
B) Skew conformation
C) Planar conformation
D) Staggered conformation
33 / 40The removal of a hydrogen halide \( (HX) \) from an alkyl halide to form an alkene is a classic example of:
A) Elimination reaction
B) Addition reaction
C) Substitution reaction
D) Rearrangement reaction
34 / 40Which specific reagent is primarily used for the dehydrohalogenation of alkyl halides?
A) Aqueous \( KOH \)
B) Alcoholic \( KOH \)
C) Concentrated \( H_2SO_4 \)
D) Dilute \( HCl \)
35 / 40Ozonolysis of Benzene \( (C_6H_6) \) followed by hydrolysis specifically yields 3 moles of:
A) Formaldehyde
B) Acetaldehyde
C) Glyoxal
D) Acetone
36 / 40According to Huckel's \( (4n+2)\pi \) rule, how many total pi \( (\pi) \) electrons are present in Benzene?
A) 2
B) 4
C) 10
D) 6
37 / 40Because it is found bubbling up in marshy places, Methane is also widely known as:
A) Marsh gas
B) Tear gas
C) Laughing gas
D) Synthesis gas
38 / 40Hydrocarbons in which carbon atoms form a straight or branched chain with single bonds only are called:
A) Unsaturated hydrocarbons
B) Saturated Alkanes
C) Aromatic hydrocarbons
D) Alicyclic hydrocarbons
39 / 40The molecular geometry (shape) of a Benzene ring is strictly:
A) Tetrahedral
B) Octahedral
C) Planar hexagonal
D) Linear
40 / 40Because of \( sp^2 \) hybridization, every \( C-C-C \) bond angle in a Benzene ring is exactly:
A) \( 109.5^\circ \)
B) \( 90^\circ \)
C) \( 180^\circ \)
D) \( 120^\circ \)
Test Analysis

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Unattempted ⚠️ 40

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