Question

Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false.
(a) $SOC{l}_2,PC{l}_3$ and $HCl$ all converts an alcohol into alkyl halide
(b) Mechanism of all the three reagent are identical
(c) A mechanism for $SOC{l}_2$ and $PC{l}_3$ are identical but different mechanism is followed in case of HCl
(d) They all are used commercially to convert acetic acid into acetyl chloride.

• A. TTFT
• B. TFFF
• C. TFTF
• D. TFFT

Answer 1

The correct option is C TFTF

$R-OH\underset{ZnC{l}_{2}anhy.}{\overset{HCl}{\to }}R-Cl+H_{2}O$

$R-OH\stackrel{SOC{l}_2}{\to }R-Cl+S{O}_2\uparrow HCl\uparrow$

$R-OH\stackrel{PC{l}_3}{\to }R-Cl+H_{3}P{O}_3$

All of the reagents have different mechanism $SOC{l}_2$ and $PC{l}_3$ are used to convert acetic acid into acetyl chloride.

$R-COOH\stackrel{SOC{l}_2}{\to }RCOCl+HCl+S{O}_2$

$RCOOH\stackrel{PC{l}_3}{\to }RCOCl+H_{3}P{O}_3$

The mechanism of $HCl$ to produce alkyl halide from alcohol involves $S{N}_1$ mechanism but $SOC{l}_2$ and $PC{l}_3$ involves $S{N}_2$ mechanism leading to inversion in product. So, the answer is Option C.