Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Advanced 2021Paper 2
Exam
JEE Advanced
Year
2021
Paper
Paper 2
Subject
Chemistry
Chapter
General Organic Chemistry

JEE Advanced 2021 · Paper 2 · Chemistry · General Organic Chemistry

Paragraph: The amount of energy required to break a bond is same as...

Paragraph: The amount of energy required to break a bond is same as the amount of energy released when the same bond is formed. In gaseous state, the energy required for homolytic cleavage of a bond is called Bond Dissociation Energy (BDE) or Bond Strength. BDE is affected by ss-character of the bond and the stability of the radicals formed. Shorter bonds are typically stronger bonds. BDEs for some bonds are given below: Paragraph: The amount of energy required to break a bond is same as the amount of energy released when the same bond is
Paragraph: The amount of energy required to break a bond is same as the amount of energy released when the same bond is
Paragraph: The amount of energy required to break a bond is same as the amount of energy released when the same bond is
Paragraph: The amount of energy required to break a bond is same as the amount of energy released when the same bond is

Question: Correct match of the C−H\mathbf{C}-\mathbf{H} bonds (shown in bold) in Column J\mathbf{J} with their BDE in Column K\mathbf{K} is Paragraph: The amount of energy required to break a bond is same as the amount of energy released when the same bond is

Options

  1. AP−iii,Q−iv,R−ii,S−iP - iii, Q - iv, R - ii, S - i
  2. BP−i,Q−ii,R−iii,S−ivP - i, Q - ii, R - iii, S - iv
  3. CP−iii,Q−ii,R−i,S−ivP - iii, Q - ii, R - i, S - iv
  4. DP−ii,Q−i,R−iv,S−iiiP - ii, Q - i, R - iv, S - iii

Correct answer

A. P−iii,Q−iv,R−ii,S−iP - iii, Q - iv, R - ii, S - i

Step-by-step solution

Relative stability of radicals :

C∙(sp)≡CH>C∙H(sp2)=CH2>C∙H2−Ph(sp3)(Resonancestabilized)>C∙H(CH3)2(sp3)\mathop{\overset{∙}{C}}_{\left(sp\right)} ≡ CH > \mathop{\overset{∙}{C}H}_{\left({sp}^{2}\right)} = {CH}_{2} > \mathop{\overset{∙}{C}{H}_{2} - Ph}_{\left({sp}^{3}\right)\left(Resonancestabilized\right)} > \mathop{\overset{∙}{C}H{\left({CH}_{3}\right)}_{2}}_{\left({sp}^{3}\right)}

So, BDEBDE

H−C≡CHH - C ≡ CH H−CH=CH2H - CH = {CH}_{2} H−CH2−PhH - {CH}_{2} - Ph H−CH(CH3)2H - CH{\left({CH}_{3}\right)}_{2}
BDEBDE 132132 110110 8888 9595

Electronegativity ∝∝ %s- character

∝∝ bond strength

∝∝ BDEBDE

Practice General Organic Chemistry on Quantrex Academy →

More from General Organic Chemistry

Given below are two statements: Statement I: Vapours of the liquid with higher boiling… JEE Main 2026The total number of aromatic compounds/species from the following is JEE Main 2026Given below are two statements : Statement I : A mixture of C _ 12 H _ 22 O _ 11 (sugar)… JEE Main 2026Shown below is the structure of methyl acetate with three different α , β and γ carbon… JEE Main 2026Given below are two statements: Statement I: 2,6 -diethylcyclohexanone and 6 -methyl- 2… JEE Main 2026Match List-I with List-II. List-I (Purification technique) List-II (Used to separate) A.… JEE Main 2026Identify the correct IUPAC name of hydrocarbon ( x ) containing three primary carbon… JEE Main 2026Given below are two statements: Statement I: On the basis of inductive effect, the order… JEE Main 2026 Full General Organic Chemistry list All JEE Advanced PYQs