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Identify the atoms that has undergone ch...

Identify the atoms that has undergone change in hybridisation in the following reactions.
(a) `CH_(3)CHO+HCN rarr CH_(3)COOH`
(b) `CH_(3)C -= N rarr CH_(3)CH_(2)CH_(3)`
(c )`CH_(3)COCH_(3) rarr CH_(3)CH_(2)CH_(3)`
(d) `CH-=CH rarr CH_(2)=CH_(2)``CH-=CH rarr CH_(2)=CH_(2)`

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