Which of the following compound will give three alkenes after dehydroh

1.	Which of the following compound will give three alkenes after dehydrohalogenation.
Answer» `CH_3-CH_2-CH_2-CH_2-BR` `CH_3-CH_2-undersetunderset(Br)(\|)CH-CH_3` `CH_3-undersetunderset(Br)(\|)oversetoverset(CH_3)(\|)C-CH_3` `CH_3-CH_2-undersetunderset(Br)(\|)CH-Ph` ANSWER :B

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