Compare the two methods shown for the preparation of carboxylic acids: Method 1: RBr \underset{diethyl \textrm{ } ether}{\overset{Mg \textrm{ }\textrm{ }\textrm{ }\textrm{ }\textrm{ }\textrm{ }\textrm{ }\textrm{ }}{\rightarrow}} RMgBr \underset{\left(\right. ii \left.\right) \textrm{ } H_{3} O^{+}}{\overset{\left(\right. i \left.\right) \textrm{ } \left(CO\right)_{2}}{\rightarrow}} \left(RCO\right)_{2} H Method 2 : RBr \overset{NaCN}{\rightarrow} RCN \underset{heat}{\overset{H_{2} O , HCl}{\rightarrow}} \left(RCO\right)_{2} H Which of the following statements correctly describes this conversion?

Engineering

Chemistry

Preparation of Alkyl Halide

Question

Compare the two methods shown for the preparation of carboxylic acids:
Method 1: $RBr \underset{diethyl ether}{\overset{Mg}{\to}} RMgBr \underset{(ii) H_{3} O^{+}}{\overset{(i) {CO}_{2}}{\to}} {RCO}_{2} H$
Method 2 : $RBr \overset{NaCN}{\to} RCN \underset{heat}{\overset{H_{2} O, HCl}{\to}} {RCO}_{2} H$
Which of the following statements correctly describes this conversion?

Method 1 will work well, but method 2 is not appropriate.

Both method 1 and method 2 are appropriate for carrying out this conversion.

Neither method 1 nor method 2 is appropriate for carrying out this conversion.

Method 2 will work well, but method 1 is not appropriate.

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Method 2 is not appropriate as given alkyl halide is a 3° R—X due to skric hindrence SN₂ not favourable.

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