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}

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

$Q \rightarrow 4 \propto- H$

$R \rightarrow 2 \propto- H$

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

$T \rightarrow 9 \propto- H$

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

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