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Objective Questions
GS
GS Set-1
Chemistry
Organic Chemistry
69

Organic Chemistry MCQ with Answers

69) Which of the following compounds has the highest melting point?

n−butane

n−pentane

n−hexane

n−heptane

Answer is:

n−heptane

Explanation:

n−heptane has the longest chain of carbon atoms.

Organic Chemistry MCQ with Answers

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70) Which of the following compounds has the highest boiling point?

Ethene

Propene

cis−2−butene

trans−2−butene

Answer is:

cis−2−butene

Explanation:

cis−isomer has higher boiling point than trans due to its greater polarity.

71) The reaction of toluene with Cl₂ in presence of FeCl₃ gives predominantly:

m−chlorobenzene

Benzoyl chloride

Benzyl chloride

o− and p−chlorotoluene

Answer is:

o− and p−chlorotoluene

Explanation:

In presence of FeCl₃ (Lewis acid), side chain hydrogen atoms of toluene are substituted.

72) Which one of the following conformations of cyclohexane is chiral?

Boat

Twist boat

Rigid

Chair

Answer is:

Twist boat

Explanation:

Chiral conformation will not have a plane of symmetry.

73) Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then heated with cuprous bromide. The reaction mixture so formed contains:

Mixture of o− and p−dibromobenzene

Mixture of o− and p−bromotoluene

Mixture of o− and p−bromoaniline

Mixture of o− and m−bromotoluene

Answer is:

Mixture of o− and p−bromotoluene

Organic Chemistry MCQ with Answers

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69) Which of the following compounds has the highest melting point?

n−heptane

Organic Chemistry MCQ with Answers

Related Organic Chemistry MCQ with Answers

70) Which of the following compounds has the highest boiling point?

cis−2−butene

71) The reaction of toluene with Cl2 in presence of FeCl3 gives predominantly:

o− and p−chlorotoluene

72) Which one of the following conformations of cyclohexane is chiral?

Twist boat

73) Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then heated with cuprous bromide. The reaction mixture so formed contains:

Mixture of o− and p−bromotoluene

Organic Chemistry MCQ with Answers

71) The reaction of toluene with Cl₂ in presence of FeCl₃ gives predominantly: