The compound (C) in the following series of reactions is:
(1) $A c e t o n e + C H_{3} M g B r D r y E t h e r ⟶ A H_{3} O^{⨁} ⟶ B$

(2) $B 363 K ⟶ 20 %, H_{2} S O_{4} C + H_{2} O$ .

2

-methylpropene

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But-

2

-ene

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But-

1

-ene

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Propene

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Solution

The correct option is D $2$ -methylpropene
The compound C in the series of reaction is 2-methylpropene.

The reaction sequence is as follows:
$(1) {({C H}_{3})}_{2} - C = O + C H_{3} - M g B r D r y E t h e r - ------- \to {({C H}_{3})}_{3} - C - O M g B r H_{3} O^{+} - -- \to {({C H}_{3})}_{3} - C - O H + O H - M g B r {(2) ({C H}_{3})}_{3} - C - O H 20 % H_{2} {S O}_{4} - ------ \to 363 K {({C H}_{3})}_{2} - C = {C H}_{2} + H_{2} O$

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