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Question

In the replacement reaction

The reaction will be most favourable if, M happens to be

A
Na
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B
Rb
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C
K
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D
Li
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Solution

The correct option is B Rb
Tertiary halide shows SN1 mechanism i.e., ionic mechanism. In the reaction given, – ve ioin will attack on carbocation. Thus, greater the tendency of ionization (greater ionic character in M-F bond) more favourable will be reaction.
The most ionic bond if Rb-F in the given examples. Thus, the most favourabl reaction is Rb-F.

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