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(A) Dehydrohalogenation in these systems often proceeds via an $E1cB$ mechanism,where the rate-determining step is the formation of a carbanion interm

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$3-$bromo$-1-$phenyl$-1,3-$butadiene

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(A) Dehydrohalogenation in these systems often proceeds via an $E1cB$ mechanism,where the rate-determining step is the formation of a carbanion intermediate.The stability of the resulting carbanion determines the ease of the reaction.In option $(A)$,the structure is $CH_2=CH-CH(Br)-CH=CH-Ph$. Upon removal of the proton at the $C3$ position,the resulting carbanion is stabilized by resonance with both the adjacent vinyl group and the phenyl ring $(Ph)$.This extensive conjugation makes the carbanion in $(A)$ the most stable among the given choices,thus making it the most reactive towards dehydrohalogenation.

Which of the following will most readily give the dehydrohalogenation product?

Similar Questions

Among the bromides $(I)-(III)$ given below,the order of reactivity for ${S_N}^1$ reaction is:

The increasing order of densities of the following alkyl halides is:
$(I)$ $n-C_3H_7Br$
$(II)$ $n-C_3H_7Cl$
$(III)$ $n-C_3H_7I$

The following reaction is a/an:
$CH_3-CH_2-CH_2-Br \xrightarrow{KOH} CH_3-CH=CH_2 + KBr + H_2O$

Which alkyl halide has maximum density?

Major products $A$ and $B$ formed in the following reaction sequence are:

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