In the following reaction,'A' is: C_2H_5MgBr | vedclass

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(B) The Grignard reagent $(C_2H_5MgBr)$ acts as a nucleophile and attacks the less hindered carbon of the ethylene oxide (oxirane) ring. This results

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$C_2H_5-CH_2-CH_2-OH$

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(B) The Grignard reagent $(C_2H_5MgBr)$ acts as a nucleophile and attacks the less hindered carbon of the ethylene oxide (oxirane) ring. This results in the opening of the ring to form an alkoxide intermediate: $C_2H_5-CH_2-CH_2-OMgBr$. Subsequent hydrolysis with $H_2O$ converts the alkoxide into a primary alcohol: $C_2H_5-CH_2-CH_2-OH$ ($n$-butanol). The overall reaction is: $C_2H_5MgBr + CH_2(O)CH_2 \xrightarrow{H_2O} C_2H_5-CH_2-CH_2-OH$.

In the following reaction,$'A'$ is:
$C_2H_5MgBr + CH_2(O)CH_2 \xrightarrow{H_2O} A$

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In the following reaction,$'A'$ is: $C_2H_5MgBr + CH_2(O)CH_2 \xrightarrow{H_2O} A$