Q 1 :

Compound A formed in the following reaction reacts with B gives the product C. Find out A and B.                 [2024]

• $A=C{H}_3-C\equiv {}^{-}\mathrm{C}\stackrel{\mathit{+}}{\mathit{N}}a, B=C{H}_3-C{H}_2-C{H}_2-Br$

   

• $A=C{H}_3-CH=C{H}_2, B=C{H}_3-C{H}_2-C{H}_2-Br$

   

• $A=C{H}_3-C{H}_2-C{H}_3, B=C{H}_3-C\equiv CH$

   

• $A=C{H}_3-C\equiv \stackrel{- +}{\mathrm{C}}Na, B=C{H}_3-C{H}_2-C{H}_3$

   

Q 2 :

The incorrect statement regarding ethyne is                            [2024]

• Both carbons are $\mathrm{sp}$ hybridised

   

• The C − C bonds in ethyne is shorter than that in ethene

   

• Ethyne is linear

   

• The carbon-carbon bonds in ethyne is weaker than that in ethene

   

Q 3 :

The major product of the following reaction is P.                            

Number of oxygen atoms present in product ‘P’ is _______. (nearest integer)                     [2024]

Q 4 :

Given below are two statements:                                      [2025]

Statement I: One mole of propyne reacts with excess of sodium to liberate half a mole of ${\mathrm{H}}_2$ gas.

Statement II: Four gram of propyne reacts with ${\mathrm{NaNH}}_2$ to liberate ${\mathrm{NH}}_3$ gas which occupies 224 mL.

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

• Statement I is correct but Statement II is incorrect

   

• Both Statement I and Statement II are incorrect

   

• Statement I is incorrect but Statement II is correct

   

• Both Statement I and Statement II are correct

   

Q 5 :

Identify product [A], [B] and [C] in the following reaction sequence.                        [2025]

${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{CH}\underset{{\mathrm{H}}_2}{\overset{\mathrm{Pd}/\mathrm{C}}{\to }}\left[\mathrm{A}\right]\underset{\left(\mathrm{ii}\right)\mathrm{Zn},{\mathrm{H}}_2\mathrm{O}}{\overset{\left(\mathrm{i}\right){\mathrm{O}}_3}{\to }}\left[\mathrm{B}\right]+\left[\mathrm{C}\right]$
 

• $\left[\mathrm{A}\right]:{\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_3,\left[\mathrm{B}\right]:{\mathrm{CH}}_3\mathrm{CHO},\left[\mathrm{C}\right]:\mathrm{HCHO}$

   

• 

   

• $\left[\mathrm{A}\right]:{\mathrm{CH}}_3-\mathrm{CH}={\mathrm{CH}}_2,\left[\mathrm{B}\right]:{\mathrm{CH}}_3\mathrm{CHO},\left[\mathrm{C}\right]:{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$

   

• $\left[\mathrm{A}\right]:{\mathrm{CH}}_3-\mathrm{CH}={\mathrm{CH}}_2,\left[\mathrm{B}\right]:{\mathrm{CH}}_3\mathrm{CHO},\left[\mathrm{C}\right]:\mathrm{HCHO}$

   

Q 6 :

The compound with molecular formula ${\mathrm{C}}_6{\mathrm{H}}_6$, which gives only one monobromo derivative and takes up four moles of hydrogen per mole for complete hydrogenation has ______ $\mathrm{\pi }$ electrons.                           [2025]

Q 7 :

But-2-yne is reacted separately with one mole of Hydrogen as shown below;

[IMAGE 125]

(A) A is more soluble than B.

(B) The boiling point and melting point of A are higher and lower than B respectively.

(C) A is more polar than B because dipole moment of A is zero.

(D) ${\mathrm{Br}}_2$ adds easily to B than A.

Identify the incorrect statements from the options given below:             [2023]

• B and C only

   

• B, C and D only

   

• A, C and D only

   

• C and D only