For the following reactions- the correct reaction rates r 1- r 2- r 1 - - r 2 - is- r 2DMSO NaSHA- r1-r2 and r1-r2 -B- r1-r2 and r2-r1-C- r2-r1 and r1-r2-D- r2-r1 and r2-r1-

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Standard XII

Chemistry

Percentage Composition

For the follo...

Question

For the following reactions, the correct reaction rates $r_{1}, r_{2}, r_{1}^{'}$ & $r_{2}^{'}$ is:

r_{1} > r_{2}

and

r_{1}^{'} > r_{2}^{'}

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r_{1} > r_{2}

and

r_{2}^{'} > r_{1}^{'}

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r_{2} > r_{1}

and

r_{1}^{'} > r_{2}^{'}

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r_{2} > r_{1}

and

r_{2}^{'} > r_{1}^{'}

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Solution

The correct option is B $r_{1} > r_{2}$ and $r_{2}^{'} > r_{1}^{'}$

$- C = O$ group increases the electrophility of the adjacent carbon and favours $S_{N} 2$ reaction.
Hence, $r_{1} > r_{2}$ .

$- O -$ group favours the substrate towards $S_{N} 1$ reaction, since it can stabilize the carbocation.
Hence, $r_{2}^{'} > r_{1}^{'}$ .

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For the following reactions, the correct reaction rates r1,r2,r′1 & r′2 is:

The correct option is B r1>r2 and r′2>r′1 −C=O group increases the electrophility of the adjacent carbon and favours SN2 reaction. Hence, r1>r2. −O− group favours the substrate towards SN1 reaction, since it can stabilize the carbocation. Hence, r′2>r′1.

For the following reactions, the correct reaction rates $r_{1}, r_{2}, r_{1}^{'}$ & $r_{2}^{'}$ is: