Identify the correct order of reactivity in electrophilic substitution reactions of the following compounds:
I)
II)
III)
IV)

Dehydrobromination (HBr^-) of the following in increasing order will be:
I)
II)
III) 

by the reaction is:

Oxidation of alkenes by cleavage with acidic or alkaline KMn04 or acidic K₂Cr2O₇ at higher temperature yields products depending upon the nature of aIkene. A hot solution ofKMnO₄ is a strong oxidising agent which gives only ketones and carboxylic . acids and not aldehydes (as they cannot be isolated).
Oxidation of alkenes with OsO₄ followed by alcoholic NaHSO₃ or Na₂SO₄ yields glycols.

An alkene 1,2-dimethyl cyclobutene on oxidation With. hot KMnO₄ gives:

Oxidation of alkenes by cleavage with acidic or alkaline KMn04 or acidic K₂Cr2O₇ at higher temperature yields products depending upon the nature of aIkene. A hot solution ofKMnO₄ is a strong oxidising agent which gives only ketones and carboxylic . acids and not aldehydes (as they cannot be isolated).

Oxidation of alkenes with OsO₄ followed by alcoholic NaHSO₃ or Na₂SO₄ yields glycols.

An alkene 1,2-dimethyl cyclobutene on oxidation With. hot KMnO₄ gives:

Oxidation of alkenes by cleavage with acidic or alkaline KMn04 or acidic K₂Cr2O₇ at higher temperature yields products depending upon the nature of aIkene. A hot solution ofKMnO₄ is a strong oxidising agent which gives only ketones and carboxylic . acids and not aldehydes (as they cannot be isolated).

Oxidation of alkenes with OsO₄ followed by alcoholic NaHSO₃ or Na₂SO₄ yields glycols.

An alkene 1,2-dimethyl cyclobutene on oxidation With. hot KMnO₄ gives:

Out of 21 tickets marked with numbers from 1 to 21, three are drawn at random. The chance that the numbers on them are in A.P., is

Three distinct numbers are selected from first 100 natural numbers. The probability that all the three numbers are divisible by 2 and 3 is

We should know the formula for combinations. We should know the concept of probability.

Suppose values taken by a variable x are such that , where  denotes the value of x in the i^th case for i = 1, 2, n. Then

Oxidation without cleavage of sigma bond takes place in alkenes.

Presence of unsaturation· -in alkenes is detected by using Baeyer's reagent. Alkenes decolourise pink colour of Baeyer’s. reagent. In presence of Baeyer's reagent, 'syn' addition of-OH groups takes place on both carbons· of double· bond. The net reaction can be given as,

Ozonolysis of· alkenes give ozonide, which on further hydrolysis gives aldehyde and/or ketone.

Linear polyenes on. ozonolysis gives two moles of acetaldehyde and one mole of propanedial. Linear polyene will be:

Hydrogenation of alkenes and alkynes takes place in presence of certain catalysts. In Sabatier Senderen's reaction, the. addition ·of hydrogen takes·· place in presence of Raney nickel· catalyst. Platinum and palladium can also be used as catalyst in these reactions. These are heterogeneous catalyst and used in. finely. divided state. Experimentally, it is observed that less. crowded alkenes adsorb H2 with faster rate. Controlled hydrogeneration of alkyne in presence of Lindlar's catalyst yields cis product i.e., 'cis' alkene. Thus, in presence of Lindlar's catalyst 'syn' addition takes place. The relative rate of hydrogenation follows the order:

Non-terminal alkynes an reduce4 in presence of Na or Li metal dissolved in liquid ammonia. In this reaction, anti-addition of hydrogen results into the trans-product. .
The product of the following reaction is:
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Hydrogenation of alkenes and alkynes takes place in presence of certain catalysts. In Sabatier Senderen's reaction, the. addition ·of hydrogen takes·· place in presence of Raney nickel· catalyst. Platinum and palladium can also be used as catalyst in these reactions. These are heterogeneous catalyst and used in. finely. divided state. Experimentally, it is observed that less. crowded alkenes adsorb H2 with faster rate. Controlled hydrogeneration of alkyne in presence of Lindlar's catalyst yields cis product i.e., 'cis' alkene. Thus, in presence of Lindlar's catalyst 'syn' addition takes place. The relative rate of hydrogenation follows the order:

Non-terminal alkynes an reduce4 in presence of Na or Li metal dissolved in liquid ammonia. In this reaction, anti-addition of hydrogen results into the trans-product.
In which of the following cases, the reaction is most. exothermic?

Hydrogenation of alkenes and alkynes takes place in presence of certain catalysts. In Sabatier Senderen's reaction, the. addition ·of hydrogen takes·· place in presence of Raney nickel· catalyst. Platinum and palladium can also be used as catalyst in these reactions. These are heterogeneous catalyst and used in. finely. divided state. Experimentally, it is observed that less. crowded alkenes adsorb H2 with faster rate. Controlled hydrogeneration of alkyne in presence of Lindlar's catalyst yields cis product i.e., 'cis' alkene. Thus, in presence of Lindlar's catalyst 'syn' addition takes place. The relative rate of hydrogenation follows the order:

Non-terminal alkynes a reduce4 in presence of Na or Li metal dissolved in liquid ammonia. In this reaction, anti-addition of hydrogen results into the trans-product.
The relative rate of catalytic hydrogenation of following. alkenes are:
I)
II)
III)
IV) </span

Compounds [X] and [Y] are respectively:

Unknown Compound (A) on oxidation with hot basic. KMnO₄ 'gives only one compound whose structure is given below,

Compound (A) will be:

Order of reactivity of given four alkenes for hydrogenation , reaction will be:
I)
II)
III)
IV)