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GS
GS Set-1
Chemistry
Organic Chemistry
90

Organic Chemistry MCQ with Answers

90) Which among the following reagents converts cyclohexene to trans diol?

Baeyer reagent

OsO₄

I₂⁄CH₃COOAg (wet)

I₂⁄CH₃COOAg (dry)

Answer is:

I₂⁄CH₃COOAg (dry)

Organic Chemistry MCQ with Answers

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91) Chloroethane reacts with magnesium in dry ether to form X. When X is hydrolysed, carbon compounds Y and Z are formed. Which of the following is Y?

C₂H₄

C₂H₂

C₂H₆

C₆H₆

Answer is:

C₂H₆

92) 18 C−H and 7 C−C sigma bonds are present in:

n−heptane

Cyclohexane

3,3−dimethyl pentane

2,2,3−trimethyl pentane

Answer is:

2,2,3−trimethyl pentane

Explanation:

Number of C−C sigma bonds = Number of carbons − 1 and Number of C−H sigma bonds = Number of hydrogens

93) The heat of hydrogenation of benzene is 50 kcal⁄mol. The resonance energy of benzene is 36 kcal⁄mol. The heat of hydrogenation of cyclohexene is approximately:

9 kcal⁄mol

19 kcal⁄mol

29 kcal⁄mol

27 kcal⁄mol

Answer is:

29 kcal⁄mol

94) Elimination of bromine from 2−bromobutane results in the formation of:

Equimolar mixture of 1− and 2−butene

Predominantly 2−butene

Predominantly 1−butene

Predominantly 2−butyne

Answer is:

Predominantly 2−butene

Organic Chemistry MCQ with Answers

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90) Which among the following reagents converts cyclohexene to trans diol?

I2⁄CH3COOAg (dry)

Organic Chemistry MCQ with Answers

Related Organic Chemistry MCQ with Answers

91) Chloroethane reacts with magnesium in dry ether to form X. When X is hydrolysed, carbon compounds Y and Z are formed. Which of the following is Y?

C2H6

92) 18 C−H and 7 C−C sigma bonds are present in:

2,2,3−trimethyl pentane

93) The heat of hydrogenation of benzene is 50 kcal⁄mol. The resonance energy of benzene is 36 kcal⁄mol. The heat of hydrogenation of cyclohexene is approximately:

29 kcal⁄mol

94) Elimination of bromine from 2−bromobutane results in the formation of:

Predominantly 2−butene

Organic Chemistry MCQ with Answers

I₂⁄CH₃COOAg (dry)

C₂H₆