1
JEE Advanced 2021 Paper 2 Online
MCQ (Single Correct Answer)
+3
-1
Change Language
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 s-character of the bond and the stability of the radicals formed. Shorter bonds are typically stronger bonds. BDEs for some bonds are given below : JEE Advanced 2021 Paper 2 Online Chemistry - Basics of Organic Chemistry Question 21 English Comprehension
Correct match of the C-H bonds (shown in bold) in Column J with their BDE in Column K is

Column J
Molecule
Column K
BDE (kcal $$mo{l^{ - 1}}$$)
(P) H-CH($$C{H_3}$$)$$_2$$ (i) 132
(Q) H-CH$$_2$$Ph (ii) 110
(R) H-CH=CH$$_2$$ (iii) 95
(S) H-C $$ \equiv $$ CH (iv) 88
A
P - iii, Q - iv, R - ii, S - i
B
P - i, Q - ii, R - iii, S - iv
C
P - iii, Q - ii, R - i, S - iv
D
P - ii, Q - i, R - iv, S - ii
2
JEE Advanced 2021 Paper 2 Online
MCQ (Single Correct Answer)
+3
-1
Change Language
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 s-character of the bond and the stability of the radicals formed. Shorter bonds are typically stronger bonds. BDEs for some bonds are given below :

JEE Advanced 2021 Paper 2 Online Chemistry - Basics of Organic Chemistry Question 22 English Comprehension

Cl $$-$$ Cl (g) $$\to$$ Cl$$_{(g)}^ \bullet $$ + Cl$$_{(g)}^ \bullet $$ $$\Delta$$H$$^\circ$$ = 58 kcal mol$$-$$1

H3C $$-$$ Cl (g) $$\to$$ H3C$$_{(g)}^ \bullet $$ + Cl$$_{(g)}^ \bullet $$ $$\Delta$$H$$^\circ$$ = 85 kcal mol$$-$$1

H $$-$$ Cl (g) $$\to$$ H$$_{(g)}^ \bullet $$ + Cl$$_{(g)}^ \bullet $$ $$\Delta$$H$$^\circ$$ = 103 kcal mol$$-$$1
For the following reaction

CH4(g) + Cl2(g) $$\buildrel {light} \over \longrightarrow $$ CH3Cl(g) + HCl (g)

the correct statement is
A
Initiation step is exothermic with $$\Delta$$H$$^\circ$$ = $$-$$58 kcal mol$$-$$1.
B
Propagation step involving $${}^ \bullet C{H_3}$$ formation is exothermic with $$\Delta$$H$$^\circ$$ = $$-$$2 kcal mol$$-$$1.
C
Propagation step involving CH3Cl formation is endothermic with $$\Delta$$H$$^\circ$$ = +27 kcal mol$$-$$1.
D
The reaction is exothermic with $$\Delta$$H$$^\circ$$ = $$-$$25 kcal mol$$-$$1.
3
JEE Advanced 2020 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1
Change Language
Newman projections P, Q, R and S are shown below :

JEE Advanced 2020 Paper 1 Offline Chemistry - Basics of Organic Chemistry Question 26 English

Which one of the following options represents identical molecules?
A
P and Q
B
Q and S
C
Q and R
D
R and S
4
JEE Advanced 2020 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1
Change Language
Which of the following structures has the IUPAC name

3-ethynyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid?
A
JEE Advanced 2020 Paper 1 Offline Chemistry - Basics of Organic Chemistry Question 25 English Option 1
B
JEE Advanced 2020 Paper 1 Offline Chemistry - Basics of Organic Chemistry Question 25 English Option 2
C
JEE Advanced 2020 Paper 1 Offline Chemistry - Basics of Organic Chemistry Question 25 English Option 3
D
JEE Advanced 2020 Paper 1 Offline Chemistry - Basics of Organic Chemistry Question 25 English Option 4
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