Which one of the following is not an int...

Which one of the following is not an intermediate in the generally accepted mechanism for the reaction shown below?
`CF_(3)overset(O)overset(||)(C)OH+CH_(3)underset(OH)underset(|)(CH)CH_(3) overset(H_(2)SO_(4))rarr CF_(3)overset(O)overset(||)(C)Ounderset(CH_(3))underset(|)(CH)-CH_(3)+H_(2)O`

`CF_(3)overset(ddot)overset(.^(+OH))overset(||)(C)-overset(ddot)underset(ddot)(O)H`

`CF_(3)underset(..)underset( :OH)underset(|)overset(ddot)overset( :OH^(-))overset(|)(C)-overset(ddot)underset(ddot)OCH(CH_(3))_(2)`

`CF_(3)underset(ddot)underset(.^(+)OH_(2))underset(|)overset(ddot)overset( :OH)overset(|)(C)-overset(ddot)underset(ddot)(C)CH(CH_(3))_(2)`

`CF_(3)underset(ddot)underset( :OH)underset(|)overset(ddot)overset( :OH)overset(|)(C)-overset(ddot)underset(ddot)(C)CH(CH_(3))_(2)`

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The correct Answer is:

In acidic medium formation of strong base, is not favourable.

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