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(A) When $1, 1-$dichloroethane $(CH_3CHCl_2)$ is heated with dilute $NaOH$,it undergoes hydrolysis to form an unstable gem-diol intermediate,$1, 1-$et

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$1, 1-$dichloroethane

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(A) When $1, 1-$dichloroethane $(CH_3CHCl_2)$ is heated with dilute $NaOH$,it undergoes hydrolysis to form an unstable gem-diol intermediate,$1, 1-$ethanediol $(CH_3CH(OH)_2)$.This unstable intermediate loses a water molecule to form acetaldehyde $(CH_3CHO)$.The reaction is as follows:$CH_3CHCl_2 + 2NaOH \rightarrow CH_3CH(OH)_2 + 2NaCl$$CH_3CH(OH)_2 \rightarrow CH_3CHO + H_2O$

The compound which forms acetaldehyde when heated with dilute $NaOH$ is

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