51.

The structure of the major product formed in the following reaction

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Reaction of trans-2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces 

• 4-phenylcyclopentene

• 2-phenylcyclopentene

• 1-phenylcyclopentene

• 1-phenylcyclopentene

The structure of the compound that gives a tribromo derivative on treatment with bromine water is

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• CH₂ = CH₂

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• dichloromethyl cation (C⁺HCl )

• dichlorocarbene ( :CCl₂) 

• trichloromethyl anion (C^-Cl₃ )

• trichloromethyl anion (C^-Cl₃ )