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(C) The synthesis of but$-1$-ene from ethanol $(CH_3CH_2OH)$ involves the following steps:$1$. Conversion of ethanol to bromoethane: $CH_3CH_2OH + HBr

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$1. HBr$,heat; $2. NaC \equiv CH; 3. H_2$,Lindlar $Pd$

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(C) The synthesis of but$-1$-ene from ethanol $(CH_3CH_2OH)$ involves the following steps:$1$. Conversion of ethanol to bromoethane: $CH_3CH_2OH + HBr \rightarrow CH_3CH_2Br + H_2O$.$2$. Nucleophilic substitution with sodium acetylide: $CH_3CH_2Br + NaC \equiv CH \rightarrow CH_3CH_2C \equiv CH$ (but$-1$-yne).$3$. Partial hydrogenation of the alkyne to an alkene using Lindlar catalyst: $CH_3CH_2C \equiv CH + H_2 \xrightarrow{Lindlar \ Pd} CH_3CH_2CH=CH_2$ (but$-1$-ene).Therefore,the correct sequence is $1. HBr$,heat; $2. NaC \equiv CH; 3. H_2$,Lindlar $Pd$.

Choose the sequence of steps that describes the best synthesis of but$-1$-ene from ethanol.

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