Hydrocarbons · Question 13

JEE Main 2026 (Online) 23rd January Morning ShiftMCQEasy📈 Topic in 13% papers+4−1

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

c < b < a
b < c < a
c < a < b
b < a < c

Answer

(4) b < a < c

Solution

Nitration (conc. HNO3 + conc. H2SO4) is an electrophilic substitution by NO2+; electron-releasing groups activate and electron-withdrawing groups deactivate the ring.

b (-NO2): strong –I and –R strongly deactivating, least reactive

a (–Cl): –I > +R weakly deactivating (o/p-directing)

c (-OCH3): +R > –I activating, most reactive

b < a < c

Answer: (4)

JEE Main 2026 (Online) 23rd January Morning Shift

Keep practising — Hydrocarbons

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 :

B and D Only
A and C Only
A and B Only
B and C Only

JEE Main 2026 (Online) 23rd January Morning Shift

[figure] Identify (P)

[figure]
[figure]
[figure]
[figure]

JEE Main 2026 (Online) 23rd January Evening Shift

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

Statement I is incorrect but Statement II is correct
Both Statement I and Statement II are correct
Both Statement I and Statement II are incorrect
Statement I is correct but Statement II is incorrect

JEE Main 2026 (Online) 22nd January Morning Shift

The cycloalkene (X) on bromination consumes one mole of bromine per mole of (X) and gives the product (Y) in which C : Br ratio is 3:1. The percentage of bromine in the product (Y) is %. (Nearest integer) (Given : molar mass in g mol-1 H : 1, C : 12, O : 16, Br : 80)

JEE Main 2026 (Online) 22nd January Morning Shift

Consider the following reaction : [figure] The product Y formed is :

2-methylhex-3-yne
5-methylhex-2-yne
Isopropylbut-1-yne
2-methylhex-2-yne

JEE Main 2026 (Online) 22nd January Evening Shift

The dibromo compound [P] (molecular formula: C9H10Br2) when heated with excess sodamide followed by treatment with dilute HCl gives [Q]. On warming [Q] with mercuric sulphate and dilute sulphuric acid yields [R] which gives positive Iodoform test but negative Tollens' test. The compound [P] is :