Question

Arrange the following compounds in increasing order of their heat of combustion :

• A. R<,Q< P< S< T
• B. T < S < P < Q < R
• C. Q< P< R< T< S
• D. R < S < T < Q < P

Answer 1

Answer: (B)

Heat of combustion (HOC) $\propto \frac{1}{\text{ stability }}$ {l|l}

$P\to 5\propto -H$ (is)

$Q\to 4\propto -H$

$R\to 2\propto -H$

$S$ & $\to 5\propto -H$ (Trans)

$T\to 9\propto -H$

Order of stability $T>S>P>Q>R$

& H.O.C $\to T<S<P<Q<R$