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(A) The reaction sequence is as follows:$1$. $CH_3-CH=CH_2 + HBr \rightarrow CH_3-CH(Br)-CH_3$ (Markovnikov addition).$2$. $CH_3-CH(Br)-CH_3 + NaOH(aq

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$4-$methylpent$-3-$en$-2-$one

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(A) The reaction sequence is as follows:$1$. $CH_3-CH=CH_2 + HBr \rightarrow CH_3-CH(Br)-CH_3$ (Markovnikov addition).$2$. $CH_3-CH(Br)-CH_3 + NaOH(aq) \rightarrow CH_3-CH(OH)-CH_3$ (Nucleophilic substitution to form propan$-2-$ol).$3$. $CH_3-CH(OH)-CH_3 \xrightarrow{Cu/573 \ K} CH_3-CO-CH_3$ (Dehydrogenation of secondary alcohol to acetone).$4$. $2 CH_3-CO-CH_3 \xrightarrow{Ba(OH)_2, \Delta} (CH_3)_2C=CH-CO-CH_3$ (Aldol condensation of acetone to form mesityl oxide,which is $4-$methylpent$-3-$en$-2-$one).

Identify the major product formed from the following reaction sequence:
$CH_3-CH=CH_2$ $\xrightarrow[(i) HBr]{(ii) NaOH}$ ${\xrightarrow[(iii) Cu/573 \ K]{(iv) Ba(OH)_2, \Delta}} ?$

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Identify the major product formed from the following reaction sequence:$CH_3-CH=CH_2$ $\xrightarrow[(i) HBr]{(ii) NaOH}$ ${\xrightarrow[(iii) Cu/573 \ K]{(iv) Ba(OH)_2, \Delta}} ?$