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NEET levelSingle correct optionDifficulty 1 of 3o4111

For an E1 elimination of an alkyl halide $RX$ , the rate law is

A $rate = k [RX] [B X^{-}]$
B $rate = k [RX]$
C $rate = k [RX] [B X^{-}]^{2}$
D $rate = k [B X^{-}]$

Answer: B

E1 is unimolecular: the slow step is ionisation of

RX

to a carbocation, and the base enters only after this step. Hence the rate depends only on

[RX]

and is first order.

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