Arrange in order of decreasing basicity. CH 3 CH 2 MgBr I HC ≡ CMgBr II CH 3 CH 2 OMgBr III

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Arrange in order of decreasing basicity.

\underset{I}{{CH}_{3} {CH}_{2} MgBr} \underset{II}{HC \equiv CMgBr} \underset{III}{{CH}_{3} {CH}_{2} OMgBr}

ChemistryGeneral Organic ChemistryNEET

Options:

A I, II, III
B I, III, II
C III, II, I
D II, I, III

Solution:

2217 Upvotes Verified Answer

The correct answer is: I, II, III

The acid strength of conjugate acid is

C H_{3} C H_{3} < H C \equiv C H < C H_{3} C H_{2} O H

Hence, the order of basic strength is

{CH}_{3} {CH}_{3} O^{-} < HC \equiv C^{-} < {CH}_{3} {CH}_{2}^{-}

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