Which of the following orders is correct for heat of hydrogenation of these compounds?

I > I I > I I I

No worries! We‘ve got your back. Try BYJU‘S free classes today!

I I I > I I > I

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

I I > I I I > I

No worries! We‘ve got your back. Try BYJU‘S free classes today!

I I I > I > I I

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A $I I I > I I > I$
Heat of hydrogenation is the measure of stability of a double bond. Smaller the numerical value of heat of hydrogenation, more stable is the double bond.
In the given compounds, considering the number of $α -$ hydrogens, $(I)$ is the most stable with $10 α - H$ , followed by $(I I I)$ with $4$ $α - H$ . $(I I)$ is the least stable with $1 - α - H$ . Hence, considering numerical value, the order of heat of hydrogenation is: $I I I > I I > I$

Suggest Corrections

Similar questions

Q. The decreasing order of acidity of the following compounds is:

Q. Arrange the following compounds in their increasing order of reactivity towards

C H_{3} O N a

Q. Predict the correct order of

- I

strength for the following groups:

I . - C H_{2} N H_{2} I I . - C H = N H I I I . - C N

Q. Arrange the following compounds in order of increasing dipole moment. (I) Toluene (II) m - dichlorobenzene (III) o - dichlorobenzene (IV) p - dichlorobenzene

Mark the correct increasing order of reactivity of the following compounds with HBr / HCl.

(a) I < II < III
(b) II < I < III
(c) II < III < I
(d) III < II < I

Join BYJU'S Learning Program