How many alkenes yield 2, 2, 3, 4, 4-pentamethyi-pentane on catalytic hydrogenation?

Only one

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Only two

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Only three

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None of these

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Solution

The correct option is A Only one
Only one alkene ( 2-(1,1-dimethyl ethyl) 3,3-dimethyl but-2-ene) on hydrogenation produces 2,2,3,4,4-pentamethyl pentane.
$C H_{2} = C (C (C H_{3})_{3})_{2} C a t a l y t i c - -------- \to H y d r o g e n a t i o n C H_{3} C H (C (C H_{3})_{3})_{2}$

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