Organic Chemistry MCQ with Answers

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?

Answer is:

C₂H₆

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

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:

Answer is:

29 kcal⁄mol

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

Answer is:

Predominantly 2−butene

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

Answer is:

Ethene

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