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Hydrocarbons

JEE Main 2025 (Online) 22nd January Evening ShiftNumericalHard📈 Topic in 29% papers+4
Ques. 1JEE Main 2025, 22 January (Evening Shift)

The compound with molecular formula C6H6, which gives only one monobromo derivative and takes up four moles of hydrogen per mole for complete hydrogenation has electrons.

Answer

8 or 6

Solution

C6H6: 4 degrees of unsaturation; 4 mol H2 ⇒ two C C (no ring). One monobromo product ⇒ symmetrical hexa-2,4-diyne:

[figure]

electrons =4 2=8

(Benzene also gives only one monobromo product: 6 electrons.)

Answer: 8 or 6

Keep practising — Hydrocarbons

Ques. 2JEE Main 2026, 8 April (Evening Shift)

n-Butane on monochlorination under photochemical condition gives an optically active compound "P". "P" on further chlorination gives dichloro compounds. The number of dichloro compounds obtained (ignore stereoisomers) is :

  1. 3
  2. 4
  3. 5
  4. 6
Ques. 3JEE Main 2026, 6 April (Morning Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
Ques. 4JEE Main 2026, 6 April (Evening Shift)

An optically active alkyl bromide C4H9Br, reacts with ethanolic KOH to form major compound [A] which reacts with bromine to give compound [B]. Compound [B] reacts with ethanolic KOH and sodamide to give compound [C]. One molecule of water adds to compound [C] on warming with mercuric sulphate and dilute sulphuric acid at 333 K to form compound [D]. The functional group in compound D will be confirmed by :

  1. Haloform test
  2. Lucas test
  3. Silver mirror test
  4. Benedict test
Ques. 5JEE Main 2026, 6 April (Evening Shift)

An alkane (Y) requires 8 moles of oxygen for complete combustion and on chlorination with Cl2/h , (Y) gives only one monochlorinated product (Z). The total number of primary carbon atoms in (Y) is .

Ques. 6JEE Main 2026, 5 April (Morning Shift)

For the following Friedel Craft's alkylation reaction, which of the statements are correct? [figure] Choose the correct answer from the options given below :

  1. A and D only
  2. B and C only
  3. A and C only
  4. B and D only
Ques. 7JEE Main 2026, 4 April (Morning Shift)

An alkene (X) on ozonolysis followed by reduction gives following products. H- O \|C-H (2 moles), H- O \|C- O \|C- O \|C-H, CH3- O \|C- O \|C- O \|C-CH3 The alkene (X) is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 8JEE Main 2026, 4 April (Evening Shift)

[figure] Compound (X) is subjected to the sequence of reactions as shown above. Molar mass of the major product (Y) formed is g mol-1. (Given molar mass in g mol-1 C : 12, H : 1, O : 16 )

  1. 90
  2. 118
  3. 160
  4. 125
Ques. 9JEE Main 2026, 2 April (Morning Shift)

One mole of an alkane (x) requires 8 mole oxygen for complete combustion. Sum of number of carbon and hydrogen atoms in the alkane (x) is .

Ques. 10JEE Main 2026, 2 April (Evening Shift)

The compound (X) on (i) on heating in the presence of anhydrous AlCl3 and HCl gas gives 2,4-dimethyl pentane (ii) aromatization gives toluene and (iii) cyclisation gives methyl cyclohexane The correct name of compound (X) is:

  1. Hept-2-ene
  2. Hept-1,3,5-triene
  3. Heptane
  4. Hept-2,4,6-triene
Ques. 11JEE Main 2026, 28 January (Morning Shift)

Given below are two statements for the following reaction sequence. [figure] In the light of the above statements, choose the correct answer from the options given below :

  1. Statement I is true but Statement II is false
  2. Both Statement I and Statement II are true
  3. Statement I is false but Statement II is true
  4. Both Statement I and Statement II are false

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