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Hydrocarbons · Question 5

JEE Main 2026 (Online) 5th April Morning ShiftMCQMedium📈 Topic in 13% papers+4−1
1

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

Answer

(2) B and C only

Solution

CH3CH2CH2Cl + AlCl3 CH3CH2 CH2 + AlCl4

The 1° carbocation rearranges by a 1,2-hydride shift to the more stable 2° isopropyl carbocation:

CH3CH2 CH2 CH3 CHCH3

⇒ Major product is isopropylbenzene (cumene), not n-propylbenzene – A incorrect, B correct.

The alkyl group introduced activates the ring (+I, hyperconjugation), so the product reacts faster than benzene ⇒ polyalkylation always accompanies the reaction – C correct.

Electron-donating groups activate the ring, so alkylbenzenes are formed even more easily – D incorrect.

∴ Correct statements: B and C

Answer: (2)

JEE Main 2026 (Online) 5th April Morning Shift

Keep practising — Hydrocarbons

2

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]
JEE Main 2026 (Online) 4th April Morning Shift
3

[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
JEE Main 2026 (Online) 4th April Evening Shift
4

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 .

JEE Main 2026 (Online) 2nd April Morning Shift
5

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
JEE Main 2026 (Online) 2nd April Evening Shift
6

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
JEE Main 2026 (Online) 28th January Morning Shift
7

Ph-CH=CH2 [HBr](PhCOO)2 Product Consider the above reaction Identify the correct statements. Choose the correct answer from the options given below :

  1. A & E Only
  2. A, B & D Only
  3. A, C & E Only
  4. C, D & E Only
JEE Main 2026 (Online) 28th January Morning Shift
8

The reactions which produce alcohol as the product are : Choose the correct answer from the options given below :

  1. B, D and E Only
  2. A and D Only
  3. A, C and E Only
  4. C and D Only
JEE Main 2026 (Online) 28th January Evening Shift
9

Consider the following compounds : [figure] Arrange these compounds in the increasing order of reactivity with nitrating mixture.

  1. c < b < a
  2. b < c < a
  3. c < a < b
  4. b < a < c
JEE Main 2026 (Online) 23rd January Morning Shift
10

But-2-yne and hydrogen (one mole each) are separately treated with (i) Pd/C and (ii) Na/ liq. NH3 to give the products X and Y respectively. [figure] Identify the incorrect statements. Choose the correct answer from the options given below :

  1. B and D Only
  2. A and C Only
  3. A and B Only
  4. B and C Only
JEE Main 2026 (Online) 23rd January Morning Shift
11

[figure] Identify (P)

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2026 (Online) 23rd January Evening Shift

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