The simplest alkene is: MCQ with Answer and Explanation

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The simplest alkene is:

A. Ethane

B. Methane

C. Propyne

D. Ethene

Answer: Option D

Solution (By JKExamLibrary)

Alkenes contain at least one carbon-carbon double bond. The simplest alkene is ethene (C₂H₄). Methane is an alkane; ethane is an alkane; propyne is an alkyne. General formula for alkenes: CₙH₂ₙ.

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Question #1

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Ethanol reacts with sodium metal to produce:

A. Carbon dioxide

B. Oxygen

C. Hydrogen gas

D. Ethane

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Correct Answer: Option C

Explanation:
2C₂H₅OH + 2Na → 2C₂H₅ONa + H₂↑. Alcohols react with alkali metals to form alkoxides and hydrogen, similar to water but slower.

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Question #2

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Hard water contains dissolved:

A. Calcium and magnesium salts

B. Ammonium salts

C. Sodium salts

D. Potassium salts

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Correct Answer: Option A

Explanation:
Hardness is caused by Ca²⁺ and Mg²⁺ ions in the form of bicarbonates, sulfates, chlorides. They react with soap to form scum.

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Question #3

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The atomic radius of chlorine is smaller than that of sulfur because:

A. Chlorine has more shells

B. Chlorine has greater nuclear charge pulling electrons closer

C. Chlorine has fewer electrons

D. Sulfur has a complete octet

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Correct Answer: Option B

Explanation:
Across period 3, S (Z=16) to Cl (Z=17) nuclear charge increases, attracting electron cloud more strongly, reducing atomic radius. Number of shells is same (3).

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