Identify A in the following reaction sequence | vedclass

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(B) The reaction starts with the chlorination of $2$-methylpropene to form $1,2$-dichloro-$2$-methylpropane. Treatment with $H_2O$ followed by $Ca(OH)

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$CH_3-CH(CH_3)-CHO$

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(B) The reaction starts with the chlorination of $2$-methylpropene to form $1,2$-dichloro-$2$-methylpropane. Treatment with $H_2O$ followed by $Ca(OH)_2$ leads to the formation of an epoxide intermediate ($1,2$-epoxy-$2$-methylpropane) via neighboring group participation $(NGP)$. Finally,in the presence of $H^+$ and heat,the epoxide undergoes ring opening followed by a hydride shift to form the stable carbonyl compound,$2$-methylpropanal $(CH_3-CH(CH_3)-CHO)$.

Identify $A$ in the following reaction sequence:

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