p-Block Elements · JEE Main previous year questions

2026 21 questions

1. Q722026 · 8 Apr 2026 · Shift 2· Numerical answer

   '$x$' is the product which is obtained from benzene by reacting it with carbon monoxide and hydrogen chloride in the presence of cuprous chloride. '$y$' is the major product obtained from the benzene by reacting it with ethanoyl chloride in the presence of anhydrous $\mathrm{AlC}{\mathrm{l}}_3$. Product (major) obtained by heating $x$ and $y$ in the presence of alkali is $z$. Total number of $\pi$ (pi) electrons in $z$ is ____.

   Show answer

   Answer: 16

2. Q512026 · 6 Apr 2026 · Shift 2

   Which of the following contain the same number of atoms ? (Given : Molar mass in ${\text{g mol}}^{-1}$ of H, He, O and S are $1,4,16$ and $32$ respectively) A. $2\text{ g}$ of ${\text{O}}_2$ gas B. $4\text{ g}$ of ${\text{SO}}_2$ gas C. $1400\text{ mL}$ of ${\text{O}}_2$ at STP D. $0.05\text{ L}$ of He at STP E. $0.0625\text{ mol}$ of ${\text{H}}_2$ gas Choose the correct answer from the options given below :

   1. A.A and B only
   2. B.B and C only
   3. C.C and D only
   4. D.A, C and E only
   Show answer

   Answer: D

3. Q532026 · 6 Apr 2026 · Shift 2

   Given below are two statements : Statement I : The number of compounds among ${\text{SO}}_2$, ${\text{SO}}_3$, ${\text{SF}}_4$, ${\text{SF}}_6$ and ${\text{H}}_2\text{S}$ in which sulphur does not obey the Octet rule is 3. Statement II : Among $[{\text{H}}_2\text{O},{\text{ClF}}_3,{\text{SF}}_4]$, $[{\text{NH}}_3,{\text{BrF}}_5,{\text{SF}}_4]$, $[{\text{BrF}}_5,{\text{ClF}}_3,{\text{XeF}}_4]$ and $[{\text{XeF}}_4,{\text{ClF}}_3,{\text{H}}_2\text{O}]$, the number of sets in which all the molecules have one lone pair of electrons on the central atom is 1. In the light of the above statements, choose the correct answer from the options given below :

   1. A.Both Statement I and Statement II are true
   2. B.Both Statement I and Statement II are false
   3. C.Statement I is true but Statement II is false
   4. D.Statement I is false but Statement II is true
   Show answer

   Answer: D

4. Q652026 · 6 Apr 2026 · Shift 2

   An optically active alkyl bromide ${\text{C}}_4{\text{H}}_9\text{Br}$, reacts with ethanolic $\text{KOH}$ to form major compound [A] which reacts with bromine to give compound [B]. Compound [B] reacts with ethanolic $\text{KOH}$ and sodamide to give compound [C]. One molecule of water adds to compound [C] on warming with mercuric sulphate and dilute sulphuric acid at $333\text{ K}$ to form compound [D]. The functional group in compound D will be confirmed by :

   1. A.Haloform test
   2. B.Lucas test
   3. C.Silver mirror test
   4. D.Benedict test
   Show answer

   Answer: A

5. Q732026 · 6 Apr 2026 · Shift 2· Numerical answer

   $500\text{ mL}$ of $0.2\text{ M}$ ${\text{MnO}}_4^{-}$ solution in basic medium when mixed with $500\text{ mL}$ of $1.5\text{ M}$ $\text{KI}$ solution, oxidises iodide ions to liberate molecular iodine. This liberated iodine is then titrated with a standard $x\text{ M}$ thiosulphate solution in presence of starch till the end point. If $300\text{ mL}$ of thiosulphate was consumed, then the value of $x$ is ________.

   Show answer

   Answer: 1

6. Q582026 · 5 Apr 2026 · Shift 1

   Given below are two statements: Statement I: The correct order of electronegativity of fluorine, oxygen and nitrogen is $\text{F}>\text{O}>\text{N}$. Statement II: The oxidation state of oxygen in ${\text{OF}}_2$ is $+2$ and in ${\text{Na}}_2\text{O}$ is $-2$. In the light of the above statements, choose the correct answer from the options given below

   1. A.Both Statement I and Statement II are true
   2. B.Both Statement I and Statement II are false
   3. C.Statement I is true but Statement II is false
   4. D.Statement I is false but Statement II is true
   Show answer

   Answer: A

7. Q722026 · 5 Apr 2026 · Shift 1· Numerical answer

   In an estimation of sulphur by Carius method $0.2\text{ g}$ of the substance gave $0.6\text{ g}$ of ${\text{BaSO}}_4$. The percentage of sulphur in the substance is _______%. (Given molar mass in ${\text{g mol}}^{-1}$ $\text{S : 32}$, ${\text{BaSO}}_4:231$)

   Show answer

   Answer: 41 or 42

8. Q702026 · 5 Apr 2026 · Shift 2

   A paper dipped in a $\text{dil. }{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$ solution of '$X$' upon treatment with $\mathrm{S}{\mathrm{O}}_2$ gas turns into green. The compound '$X$' is :

   1. A.KI-starch
   2. B.$\mathrm{KMn}{\mathrm{O}}_4$
   3. C.$\mathrm{Pb}(\mathrm{C}{\mathrm{H}}_3\mathrm{COO}{)}_2$
   4. D.${\mathrm{K}}_2\mathrm{C}{\mathrm{r}}_2{\mathrm{O}}_7$
   Show answer

   Answer: D

9. Q722026 · 5 Apr 2026 · Shift 2· Numerical answer

   RMgI when treated with ice cold water liberated a gas which occupied $1.4\mathrm{d}{\mathrm{m}}^3/g$ at STP. The gas produced is further reacted with iodine in presence of $\mathrm{HI}{\mathrm{O}}_3$ to give compound (X). Compound (X) in presence of Na and dry ether produced compound (Y). Molar mass of compound (Y) is ____ $\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$. (Nearest integer)

   Show answer

   Answer: 30

10. Q752026 · 4 Apr 2026 · Shift 2· Numerical answer

    In sulphur estimation, $2.0\times 10^{-3}\mathrm{mol}$ of an organic compound (X) (molar mass $76\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$) gave $0.4813\mathrm{g}$ of barium sulphate (molar mass $233\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$). The percentage of sulphur in the compound (X) is ____ $\times 10^{-1}\%$ (Nearest integer)

    Show answer

    Answer: 435

11. Q532026 · 2 Apr 2026 · Shift 2

    $\mathrm{S}{\mathrm{F}}_4$ is isostructural with : A. $\mathrm{Br}{\mathrm{F}}_4^{-}$ B. $\mathrm{C}{\mathrm{H}}_4$ C. $\mathrm{I}{\mathrm{F}}_4^{+}$ D. $\mathrm{Xe}{\mathrm{F}}_4$ E. $\mathrm{Xe}{\mathrm{O}}_2{\mathrm{F}}_2$ Choose the correct answer from the options given below :

    1. A.C Only
    2. B.C and E Only
    3. C.A and D Only
    4. D.B and E Only
    Show answer

    Answer: B

12. Q742026 · 28 Jan 2026 · Shift 1· Numerical answer

    0.53 g of an organic compound $(x)$ when heated with excess of nitric acid (concentrated) and then with silver nitrate gave 0.75 g of silver bromide precipitate. 1.0 g of $(x)$ gave 1.32 g of ${\text{CO}}_2$ gas on combustion. The percentage of hydrogen in the compound $(x)$ is _____ %. [Nearest Integer] [Given: Molar mass in $\text{g}{\text{mol}}^{-1}$ $\text{H}:1$, $\text{C}:12$, $\text{Br}:80$, $\text{Ag}:108$, $\text{O}:16$; Compound $(x):{\text{C}}_x{\text{H}}_y{\text{Br}}_z$]

    Show answer

    Answer: 4

13. Q512026 · 28 Jan 2026 · Shift 2

    A student performed analysis of aliphatic organic compound 'X' which on analysis gave C = 61.01%, H = 15.25%, N = 23.74%. This compound, on treatment with ${\text{HNO}}_2/{\text{H}}_2\text{O}$ produced another compound 'Y' which did not contain any nitrogen atom. However, the compound 'Y' upon controlled oxidation produced another compound 'Z' that responded to iodoform test. The structure of 'X' is :

    1. A.${\text{CH}}_3-{\text{CH}}_2\text{CH}({\text{NH}}_2)-{\text{CH}}_3$
    2. B.${\text{CH}}_3{\text{CH}}_2{\text{CH}}_2{\text{NH}}_2$
    3. C.$\text{Ph}-\text{CH}({\text{CH}}_3)-{\text{NH}}_2$
    4. D.$({\text{CH}}_3{)}_2\text{CH}-{\text{NH}}_2$
    Show answer

    Answer: D

14. Q542026 · 28 Jan 2026 · Shift 2

    Match List – I with List – II according to shape. $$\begin{array}{ll}\text{List – I}& \text{List – II}\\ \text{A. }{\text{XeO}}_3& \text{I. }{\text{BrF}}_5\\ \text{B. }{\text{XeF}}_2& \text{II. }{\text{NH}}_3\\ \text{C. }{\text{XeO}}_2{\text{F}}_2& \text{III. }[{\text{I}}_3{]}^{-}\\ \text{D. }{\text{XeOF}}_4& \text{IV. }{\text{SF}}_4\end{array}$$ Choose the correct answer from the options given below :

    1. A.A-II, B-III, C-I, D-IV
    2. B.A-III, B-II, C-IV, D-I
    3. C.A-II, B-III, C-IV, D-I
    4. D.A-II, B-I, C-III, D-IV
    Show answer

    Answer: C

15. Q672026 · 28 Jan 2026 · Shift 2

    A student has been given 0.314 g of an organic compound and asked to estimate Sulphur. During the experiment, the student has obtained 0.4813 g of barium sulphate. The percentage of sulphur present in the compound is ________. (Given Molar mass in ${\text{g mol}}^{-1}$ $\text{S}:32,{\text{BaSO}}_4:233$)

    1. A.63.15%
    2. B.21.05%
    3. C.48.24%
    4. D.42.10%
    Show answer

    Answer: B

16. Q532026 · 23 Jan 2026 · Shift 2

    In Carius method 0.2425 g of an organic compound gave 0.5253 g silver chloride. The percentage of chlorine in the organic compound is

    1. A.87.65%
    2. B.53.58%
    3. C.37.57%
    4. D.34.79%
    Show answer

    Answer: B

17. Q572026 · 23 Jan 2026 · Shift 2
    
    1. A.Both Statement I and Statement II are true
    2. B.Statement I is false but Statement II is true
    3. C.Statement I is true but Statement II is false
    4. D.Both Statement I and Statement II are false
    Show answer

    Answer: A

18. Q712026 · 23 Jan 2026 · Shift 2· Numerical answer
    
    Show answer

    Answer: 10

19. Q712026 · 22 Jan 2026 · Shift 1· Numerical answer

    Sodium fusion extract of an organic compound $(\mathrm{Y})$ with $\mathrm{CHC}{\mathrm{l}}_3$ and chlorine water gives violet color to the $\mathrm{CHC}{\mathrm{l}}_3$ layer. 0.15 g of $(\mathrm{Y})$ gave 0.12 g of the silver halide precipitate in Carius method. Percentage of halogen in the compound $(\mathrm{Y})$ is ____. (Nearest integer) (Given : molar mass $\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$ $\mathrm{C}:12,\mathrm{H}:1,\mathrm{Cl}:35.5,\mathrm{Br}:80,\mathrm{I}:127$)

    Show answer

    Answer: 43

20. Q662026 · 21 Jan 2026 · Shift 1

    80 mL of a hydrocarbon on mixing with 264 mL of oxygen in a closed U-tube undergoes complete combustion. The residual gases after cooling to 273 K occupy 224 mL . When the system is treated with KOH solution, the volume decreases to 64 mL . The formula of the hydrocarbon is :

    1. A.${\mathrm{C}}_2{\mathrm{H}}_2$
    2. B.${\mathrm{C}}_2{\mathrm{H}}_4$
    3. C.${\mathrm{C}}_4{\mathrm{H}}_{10}$
    4. D.${\mathrm{C}}_2{\mathrm{H}}_6$
    Show answer

    Answer: A

21. Q682026 · 21 Jan 2026 · Shift 1

    In Carius method, 0.75 g of an organic compound gave 1.2 g of barium sulphate, find percentage of sulphur (molar mass $32\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$). Molar mass of barium sulphate is $233\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$.

    1. A.4.55%
    2. B.16.48%
    3. C.$10.30\%$
    4. D.$21.97\%$
    Show answer

    Answer: D