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Question

Statement 1: correct order of acidic strength is CH3CH3>CH2=CH2>HC=Ch
Statement 2:- C-H bond energy in ethene is more than ethane but less than ethyne.

A
Statement 1 is true, Statement 2 is true and Statement 2 is correct explanation for Statement 1.
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B
Statement 1 is true, Statement 2 is true and Statement 2 is NOT the correct explanation for Statement 1.
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C
Statement 1 is true, Statement 2 is false
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D
Statement 1 isfalse, Statement 2 is true
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Solution

The correct option is C Statement 1 isfalse, Statement 2 is true

Ethyne> Ethene >Ethane .

This can be explained with the Hydrogen donating tendency of hydrocarbon, carbon which is more electronegative will create high positive charge on hydrogen, hence that hydrocarbon will me most acidic.

  • Ethyne is most acidic because it contains acidic hydrogen (hydrogen connected with sp hybridised carbon ) % S character is 50%,hence most electronegative .

Both the hydrogen atoms are identical and connected with carbon which is sp hybridised hence, Ethyne is most acidic.

  • Ethene is less acidic than Ethene as the carbon containing hydrogen is sp2 hybridised (%s character is 33.3, hence less electronegative).

Four identical hydrogen connected with sp2 hybridised carbon,hence less acidic in nature.

  • Ethane is least acidic because both the carbons are sp3 hybridised (%s character is 25%, hence least electronegative).

Six hydrogen is attached with sp3 hybridised carbon.

Hence A is false and R is true


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