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The number of alpha-hydrogens responsible for the hyperconjugative stabilisation of the tert-butyl cation, (CH3)3C+, is:

Answer: 9.

Correct answer: C. 9

Explanation: Each of the three methyl groups attached to the positive carbon has three C-H bonds, giving 9 alpha C-H bonds available for hyperconjugation.

Geometric (cis-trans) isomers of 1,2-dichloroethene differ only in the relative arrangement of groups across the rigid C=C double bond.

Concept context

General Organic Chemistry covers the rules behind all organic reactions. Covers inductive effect, resonance, hyperconjugation, types of reactions (substitution, addition, elimination), and isomerism including optical and geometric forms.

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The number of alpha-hydrogens responsible for the hyperconjugative stabilisation of the tert-butyl cation, (CH<sub>3</sub>)<sub>3</sub>C<sup>+</sup>, is:

Concept context

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