$β$ -Elimination or anti-elimination reaction is carried out with base $(B^{. . ⊖})$ as shown.
The following bases are used.
$(I) ⊖ O H$ $(I I) R O^{⊖}$ $(I I I) R C O O^{⊖}$ $(I V) ⊖ C N$ $(V) N O_{3}^{⊖}$
The decreasing order of reactivity for the above elimination is :

(I I) > (I) > (I V) > (I I I) > (V)

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(V) > (I I I) > (I V) > (I) > (I I)

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(I I) > (I) > (I I I) > (I V) > (V)

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(I) > (I I) > (I I I) > (I V) > (V)

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Solution

The correct option is B $(I I) > (I) > (I V) > (I I I) > (V)$
The reagent should be a strong bronsted base.
Acidic order: $H {N O}_{3} > R C O O H > H C N > H_{2} O > R O H$
Basic order : ${N O}_{3}^{⊖} < R C O O^{⊖} < {C N}^{⊖} < ⊖ O H < {R O}^{⊖}$
Decreasing order of basicities and hence $β$ -elimination is : $(I I) > (I) > (I V) > (V)$ .

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β -

Elimination or anti-elimination reaction is carried out with base

(B^{⊖})

as shown.

The following bases are used,

(I) ⊖ O H (I I) R O^{⊖} (I I I) R C O O^{⊖} (I V) ⊖ C N (V) N O_{3}^{⊖}

The decreasing order of reactivity for the above elimination is :

Q. Arrange the following alcohols in the decreasing order of their ease of dehydration with

H_{2} S O_{4}

Predict the order of reactivity of the following compounds in dehydrohalogenation.

Mark the correct order of decreasing acid strength of the following compounds.

(a) V > IV > II > I > III
(b) II > IV > I > III > V
(c) IV > V > III > II > I
(d) V > IV > III > II > I

Arrange the following carbocations in decreasing order of stability

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β-Elimination or anti-elimination reaction is carried out with base (B..⊖) as shown.The following bases are used.(I)⊖OH (II)RO⊖ (III)RCOO⊖ (IV)⊖CN (V)NO⊖3The decreasing order of reactivity for the above elimination is :

The correct option is B (II)>(I)>(IV)>(III)>(V)The reagent should be a strong bronsted base.Acidic order: HNO3>RCOOH>HCN>H2O>ROHBasic order : NO⊖3<RCOO⊖<CN⊖<⊖OH<RO⊖Decreasing order of basicities and hence β-elimination is : (II)>(I)>(IV)>(V).

$β$ -Elimination or anti-elimination reaction is carried out with base $(B^{. . ⊖})$ as shown.
The following bases are used.
$(I) ⊖ O H$ $(I I) R O^{⊖}$ $(I I I) R C O O^{⊖}$ $(I V) ⊖ C N$ $(V) N O_{3}^{⊖}$
The decreasing order of reactivity for the above elimination is :