Which one is the correct order of acidity? - Chemistry MCQ NEET (UG) 2017 2026 | ExamTest.live | ExamTest.live

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Which one is the correct order of acidity?

A $CH \equiv CH > CH_{3} - C \equiv CH > CH_{2} = CH_{2} > CH_{3} - CH_{3}$
B $CH \equiv CH > CH_{2} = CH_{2} > CH_{3} - C \equiv CH > CH_{3} - CH_{3}$
C $CH_{3} - CH_{3} > CH_{2} = CH_{2} > CH_{3} - C \equiv CH > CH \equiv CH$
D $CH_{2} = CH_{2} > CH_{3} - CH = CH_{2} > CH_{3} - C \equiv CH > CH \equiv CH$

Solution & Step-by-step Explanation

Acidity follows the s -character of the hybrid orbital of Carbon. s p (50% s) > s p^{2} (33% s) > s p^{3} (25% s).Ethyne (CH \equiv CH) has two acidic hydrogens.Propyne (CH_{3} - C \equiv CH) has one, but the methyl group is + I donating, which reduces acidity slightly compared to ethyne.Alkenes and alkanes are much less acidic.Correct order: Alkyne > Alkene > Alkane.

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Which one is the correct order of acidity?

A

CH \equiv CH > CH_{3} - C \equiv CH > CH_{2} = CH_{2} > CH_{3} - CH_{3}

B

CH \equiv CH > CH_{2} = CH_{2} > CH_{3} - C \equiv CH > CH_{3} - CH_{3}

C

CH_{3} - CH_{3} > CH_{2} = CH_{2} > CH_{3} - C \equiv CH > CH \equiv CH

D

CH_{2} = CH_{2} > CH_{3} - CH = CH_{2} > CH_{3} - C \equiv CH > CH \equiv CH

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Organic Chemistry Hydrocarbons Acidity

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