1
JEE Advanced 2023 Paper 1 Online
MCQ (Single Correct Answer)
+3
-1
Match the reactions in List-I with the features of their products in List-II and choose the correct option.
List - I | List - II |
---|---|
(P) ![]() |
(1) Inversion of configuration |
(Q) ![]() |
(2) Retention of configuration |
(R) ![]() |
(3) Mixture of enantiomers |
(S) ![]() |
(4) Mixture of structural isomers |
(5) Mixture of diastereomers |
2
JEE Advanced 2021 Paper 2 Online
MCQ (Single Correct Answer)
+3
-1
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 :


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 |
3
JEE Advanced 2021 Paper 2 Online
MCQ (Single Correct Answer)
+3
-1
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 :

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

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
CH4(g) + Cl2(g) $$\buildrel {light} \over \longrightarrow $$ CH3Cl(g) + HCl (g)
the correct statement is
4
JEE Advanced 2020 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1
Newman projections P, Q, R and S are shown below :

Which one of the following options represents identical molecules?

Which one of the following options represents identical molecules?
Questions Asked from Basics of Organic Chemistry (MCQ (Single Correct Answer))
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