Order of heat of hyderogenation:

2 > 3 > 5 > 1 > 4

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2 > 3 > 5 > 4 > 1

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1 > 2 > 3 > 5 > 4

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5 > 3 > 2 > 4 > 1

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Solution

The correct option is D $5 > 3 > 2 > 4 > 1$
Heat of hydrogenation $(△ H^{o})$ of an alkene is standard enthalphy of catalytic hydrogenation of an alkene, catalytic hydrogenation of an alkene is always exothermic, therefore heat of hydrogenation of alkene is always negative.
Heat of hydrogenation of alkene is a mesure of he stability of $C = C$ . All the else being the same, smaller value of $△ H^{o}$ . The more stable the value the double therein. So order based on $C = C$ tetrasubstituted>trisubstituted> dissubstituted>Mono substituted> Unsubstituted.
Heat of hydrogenation order $5 > 3 > 2 > 4 > 1$
More stable alkene have smallest value of heat of hydrogenation.

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Q. Which option shows the correct order involved in nutrition of animals.
1. egestion
2. ingestion
3. assimiltion
4. absorption
5. digestion

(a) 1-2-3-4-5
(b) 2-5-3-4-1
(c) 2-4-5-3-1
(d) 2-5-4-3-1

(1) 4² + 2⁴− 3²

(2) 3³ − 2²+ 2⁰

(3) 5³ − 2² + 4⁰

(4) 6¹ + 5⁰ − 4¹

(5) (−2)² + 1² − 2²

$\int \frac{1}{2 + 3 s i n x} d x$

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