Select the correct option based on statements below:
Assertion (A): 2-butyne on controlled hydrogenation with Pd/CaCO3 (Lindlar's catalyst) in presence of PbO gives cis 2-butene.
Reason (R): Hydrogenation occurs at the surfaces of metal-containing adsorbed hydrogen.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Alkanes, Alkenes and Alkynes - Chemical Properties |
 54%
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Assertion(A): Alkanes having more than three carbon atoms exhibit chain isomerism.
Reason(R): All carbon atoms in alkanes are sp-hybridized.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. Both A and R are false statements.
Subtopic:  Aliphatic Hydrocarbon -Nomenclature, Isomerism & Mechanism |
 82%
From NCERT
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Given below are two statements: 
Assertion (A): Alkenes and series of cycloalkanes of hydrocarbons have the same general formula.
Reason (R): Either insertion of a double bond or formation of a ring reduces the number of hydrogen atoms of the corresponding alkane by 2.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.

 
Subtopic:  Aliphatic Hydrocarbon -Nomenclature, Isomerism & Mechanism |
 78%
From NCERT
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Assertion (A): 2-Bromobutane, in reaction with sodium ethoxide in ethanol, gives 1-butene as a major product.
Reason (R): 1-Butene is more stable than 2-butene.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Alkanes, Alkenes and Alkynes - Chemical Properties |
 66%
From NCERT
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Assertion(A): The addition of HBr on 2-butene gives two isomeric products.
Reason(R): The addition of HBr on 2-butene follows Markovnikov's rule.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. Both A and R are false statements.
Subtopic:  Alkanes, Alkenes and Alkynes - Chemical Properties |
From NCERT
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Assertion(A): Alkyl benzene is not prepared by Friedel-Crafts alkylation of benzene.
Reason(R): Alkyl halides are less reactive than acyl halides.
1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. Both A and R are false statements.
Subtopic:  Aromatic Hydrocarbons - Benzene - Structure, Preparation & Chemical Reactions |
 71%
From NCERT
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Assertion(A): \(CH\equiv C-CH_2-CH=CH_2\) adds up HBr to give \(CH\equiv C-CH_2-CH-CH_3\\ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|\\ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Br \) while \(CH\equiv C-CH=CH_2\) adds HBr to give \(CH_2= C-CH=CH_2\\ ~~~~~~~~~~~~~~|\\ ~~~~~~~~~~~~~Br\) .
Reason(R): Double bond is more reactive than triple bond towards electrophilic \(\)addition reaction.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. Both A and R are false statements.
Subtopic:  Alkanes, Alkenes and Alkynes - Chemical Properties |
 52%
From NCERT
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Assertion(A): When propene reacts with H-Br in the presence of H2O2 it gives Markwonikoff's addition product.
Reason(R): H2Oforms free radical which cause homolytic cleavage of H-Br.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true statement but R is false.
4. Both A and R are false statements.
Subtopic:  Alkanes, Alkenes and Alkynes - Chemical Properties |
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Assertion (A): Trans-but-2-ene has a higher boiling point than cis-but-2-ene.
Reason (R): Trans-but-2-ene is more polar than cis-but-2-ene.
  
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Aliphatic Hydrocarbon- Physical Properties |
 58%
From NCERT
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Assertion (A):  Treatment of 1,2-dibromopropane with zinc produces cyclopropane.
Reason (R):  The reaction of alkyl halides with any metal is called a substitution reaction.
 
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Aliphatic Hydrocarbon- Physical Properties |
 60%
From NCERT
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