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Consider the reaction : CH(3)CH(2)CH(2...

Consider the reaction :
`CH_(3)CH_(2)CH_(2)Br+NaCNrarrCH_(3)CH_(2)CH_(2)CN+NaBr`
This reaction will be the fastest in :

A

`N,N^(+)`- dimethyl formamide (DMF)

B

Water

C

Ethanol

D

Methanol

Text Solution

Verified by Experts

The correct Answer is:
A
`CH_3CH_2CH_3Br + NaCN to CH_3CH_2CH_2CN + NaBr`
This is a substitution reaction & follows `S_N 2` pathway. Reagents which gives fastest `S_N 2` reaction are `DMSO` (dimethyl sulphoxide) or DMF (`N, N^+` dimethyl for amide) , these are non, polar solvents.
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Knowledge Check

  • Consider the reaction : CH_(3)CH_(2)CH_(2)Br+NaCN to CH_(3)CH_(2)CH_(2)CN+NaBr This reaction will be the fastest in

    A
    water
    B
    ethanol
    C
    methanol
    D
    N,N-dimethylformamide (DMF)

  • consider the reaction: CH_(3)CH_(2)CH_(2)Br + NaCN to CH_(3)CH_(2)CH_(2)CN + NaBr This reaction will be fastest in:

    A
    ethanol
    B
    methanol
    C
    N, `N^(')`-dimethyl formamide (DMF)
    D
    water

  • Consider the reaction, CH_(3)CH_(2)CH_(2)Br+NaCn to CH_(3)CH_(2)CH_(2)CN+NaBr This reaction will be the faster in

    A
    ethanol
    B
    methanol
    C
    N, N'-dimethylformamide (DMF)
    D
    water

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