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Which of the following carbocation is mo...

Which of the following carbocation is most stable ?
(a) `(CH_(3))_(3)C.overset(+)CH_(2)` (b) `(CH_(3))_(3)overset(+)C` (c) `CH_(3)CH_(2)overset(+)CH_(2)` (d) `CH_(3)overset(+)CHCH_(2)CH_(3)`

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Which H atom in the following ester is most acidic ? overset(1)(CH_(3))-overset(2)(CH_(2))-overset(O)overset(||)(C)-overset(3)(CH_(2))-overset(O)overset(||)(C)-O-overset(4)(CH_(2))overset(5)(CH_(3))