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JEE Main 20209 JanuaryMorning Shift
Exam
JEE Main
Year
2020
Date
9 January
Shift
Morning Shift
Subject
Chemistry
Chapter
Hydrocarbons

JEE Main 2020 · 9 January · Morning Shift · Chemistry · Hydrocarbons

The correct order of heat of combustion for following alkadienes is:

The correct order of heat of combustion for following alkadienes is:
The correct order of heat of combustion for following alkadienes is:

Options

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

Correct answer

A. (a)<(b)<(c)\left(a\right) < \left(b\right) < \left(c\right)

Step-by-step solution

The correct order of heat of combustion for following alkadienes is:

∴∴ Generally trans is more stable than cis form.

Heat of combustion (HOC)∝1Stability( \text{HOC} ) ∝ \dfrac{1}{\text{Stability}}

Stability : a > b > c

HOC : c > b > a
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