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Give the reactivity in the decreasing or...

Give the reactivity in the decreasing order of the following alkynes towards nucleophilic addition reaction with `MeO^(Θ)//MeOH`.
(I) (II) `Me--=-Me`
(III) `Me--=-H` (IV) `H--=-H`

A

(a) `(I)gt(II)gt(III)gt(IV)`

B

(b) `(I)gt(IV)gt(III)gt(II)`

C

(c) `(IV)gt(III)gt(II)gt(I)`

D

(d) `(II)gt(III)gt(IV)gt(I)`

Text Solution

Verified by Experts

The correct Answer is:
B
Nucleophilic addition (NA) reaction is favoured by EWG, so the answer is (b).
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Knowledge Check

  • Give the reactivity in the decreasing order of the following nucleophiles towards nucleophilic addition reaction with compound A(F_3C--=-CF_3) . (I) CH_3O^(Θ) (II) C_3H_5^(Θ) (III) CH_3COO (IV) CH_3SO_3^(Θ)

    A
    (a) `(II)gt(I)gt(III)gt(IV)`
    B
    (b) `(IV)gt(III)gt(I)gt(II)`
    C
    (c) `(I)gt(II)gt(IV)gt(III)`
    D
    (d) `(III)gt(IV)gt(II)gt(I)`

  • The general order of reactivity of carbonyl compounds towards nucleophilic addition reaction is

    A
    `H_(2)C = O gt RCHO gt ArCHO gt R_(2)C = O gt Ar_(2)C = O`
    B
    `ArCHO gt Ar_(2)C = O gt RCHO gt R_(2)C = O gt H_(2)C = O`
    C
    `Ar_(2)C = O gt R_(2)C = O gt ArCHO gt RCHO gt H_(2)C = O`
    D
    `H_(2)C = O gt R_(2)C = O gt Ar_(2)C = O gt RCHO gt ArCHO`

  • Which of the following compounds is most reactive towards nucleophilic addition reactions ?

    A
    `CH_(3)-overset(O)overset("||")C-CH_(3)`
    B
    `CH_(3)-overset(O)overset("||")C-H`
    C
    D

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