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

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92

Organic Chemistry MCQ with Answers

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

Organic Chemistry MCQ with Answers

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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

95) Electrolysis of cold concentrated aqueous solution of potassium succinate yields:

Ethane

Ethyne

Ethene

Ethane−1,2−diol

Answer is:

Ethene

96) 1,2−dibromopropane on treatment with X moles of NaNH₂ followed by treatment with ethyl bromide gave pentyne. The value of X is:

Answer is:

3 Organic Chemistry MCQ with Answers

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

2,2,3−trimethyl pentane

Organic Chemistry MCQ with Answers

Related Organic Chemistry MCQ with Answers

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

95) Electrolysis of cold concentrated aqueous solution of potassium succinate yields:

Ethene

96) 1,2−dibromopropane on treatment with X moles of NaNH2 followed by treatment with ethyl bromide gave pentyne. The value of X is:

3

Organic Chemistry MCQ with Answers

96) 1,2−dibromopropane on treatment with X moles of NaNH₂ followed by treatment with ethyl bromide gave pentyne. The value of X is: