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 |
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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 |
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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 statements.
Subtopic:  Aliphatic Hydrocarbon -Nomenclature, Isomerism & Mechanism |
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Assertion(A): 2-bromobutane on 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 statements.
Subtopic:  Alkanes, Alkenes and Alkynes - Chemical Properties |
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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 |
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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 |
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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 |
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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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Select the correct option based on statements below:
 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 |
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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 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 a true statement but R is false.
4. Both A and R are false statements.
Subtopic:  Aliphatic Hydrocarbon- Physical Properties |
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