1.

A carboxylic acid can best be converted into acid chloride by using

Answer»

`PCl_5`
`SOCl_2`
HCL
ClCOCOCl

Solution :Use of `SOCl_2` and CICOCOCI forms gaseous by products which can be easily removed, GIVING better yield of RCOCI. Further, oxalyl chIoride is particularly easy to use becasue any excess of it can be easily evaporated due to its low b.p. (`62^@C`)
`R-oversetOoverset(||)C-OH +Cl - OVERSET(O)overset"||"C-overset(O)overset(||)C-Cl to R-overset(O)overset(||)C-Cl + HCl uarr + CO uarr + CO_2 uarr`


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