Question

The following method cannot be considered suitable for the preparation of alkly halide:

• A. Halogenation of alkane
• B. ROH and PX3
• C. ROH and HX
• D. Alkene and HX

Answer 1

Answer: (A)

Halogenation of alkane

Answer 2

(1) $R - H + X_{2}\underset{UVlight}{\overset{\quad Hightemp.400^{0}\quad}{\rightarrow}}R - X + HX$

This is most drastic method as it requires High temperature or catalyst CuCl2, FeCl3, FeBr3 etc.

(2) $ROH + PX_{3}\overset{\quad\quad}{\rightarrow}3RX + H_{3}PO_{3}$

(3) $ROH + HX\overset{\quad\quad}{\rightarrow}R - X + H_{2}O$

(4)

(2). (3 ) & (4 ) are very feasible process