Answer:
(a)
is a 2° alkyl
halide while is a 1° alkyl
halide.
Since 2° alkyl halide react faster than 1° alkyl halide due
to greater stability of 2° carbocation over 1° carbocation, therefore, a is more faster
than, .
(b) Grignard reagents should be prepared under
anhydrous condition because the magnesium bond is covalent but highly polar
with carbon pulling electrons from electropositive magnesium, the
magnesium-halogen bond is essentially ionic. If water is present it convert
Grignard reagents to corresponding hydrocarbon. 1
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