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JEE Main 201912 JanuaryEvening Shift
Exam
JEE Main
Year
2019
Date
12 January
Shift
Evening Shift
Subject
Chemistry
Chapter
Carboxylic Acid Derivatives

JEE Main 2019 · 12 January · Evening Shift · Chemistry · Carboxylic Acid Derivatives

The increasing order of the reactivity of the following with LiAl H...

The increasing order of the reactivity of the following with LiAlH4\text{L}\text{i}\text{A}\text{l}{\text{H}}_{4} is:

(A)( A ) The increasing order of the reactivity of the following with LiAl H _ 4 is: ( A ) ( B ) ( C ) ( D )

(B)( B ) The increasing order of the reactivity of the following with LiAl H _ 4 is: ( A ) ( B ) ( C ) ( D )

(C)( C ) The increasing order of the reactivity of the following with LiAl H _ 4 is: ( A ) ( B ) ( C ) ( D )

(D)( D ) The increasing order of the reactivity of the following with LiAl H _ 4 is: ( A ) ( B ) ( C ) ( D )

Options

  1. A(B)<(A)<(D)<(C)\left(B\right) < \left(A\right) < \left(D\right) < \left(C\right)
  2. B(A)<(B)<(C)<(D)\left(A\right) < \left(B\right) < \left(C\right) < \left(D\right)
  3. C(A)<(B)<(D)<(C)\left(A\right) < \left(B\right) < \left(D\right) < \left(C\right)
  4. D(B)<(A)<(C)<(D)\left(B\right) < \left(A\right) < \left(C\right) < \left(D\right)

Correct answer

C. (A)<(B)<(D)<(C)\left(A\right) < \left(B\right) < \left(D\right) < \left(C\right)

Step-by-step solution

In the mentioned structures H−willgetadded{\text{H}}^{-}will get added to the carbon having slight positive charge.

Presence of Cl\text{C}\text{l} increases the positive charge whereas an electron donating group like\text{N}{\text{H}_{2} decreases the tendency.

Rate of reaction ∝−Mor−I∝ - \text{M} or - \text{I} group

Rate of reaction ∝1+Mand1+I∝ \dfrac{1}{+ \text{M}} and \dfrac{1}{+ \text{I}}

Hence, the correct order will be:

The increasing order of the reactivity of the following with LiAl H _ 4 is: ( A ) ( B ) ( C ) ( D )

The increasing order of the reactivity of the following with LiAl H _ 4 is: ( A ) ( B ) ( C ) ( D )

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