Major product 'P' formed in the following rea | vedclass

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(B) The reaction involves the electrophilic addition of $Br_2$ to the alkene group of pent$-4-$enoic acid. $1$. $Br_2$ reacts with the double bond to

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(B) The reaction involves the electrophilic addition of $Br_2$ to the alkene group of pent$-4-$enoic acid. $1$. $Br_2$ reacts with the double bond to form a cyclic bromonium ion intermediate. $2$. The base $NaHCO_3$ deprotonates the carboxylic acid group to form a carboxylate anion $(R-COO^-)$. $3$. This carboxylate anion acts as an internal nucleophile and attacks the more substituted carbon of the bromonium ion,leading to an intramolecular cyclization (halolactonization). $4$. This results in the formation of a five-membered lactone ring with a bromomethyl group attached,which is the major product $P$.

Major product '$P$' formed in the following reaction is:-

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