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General Mechanism of Electrophilic Aromatic Substitution

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The correct order for homolytic bond dissociation energies (△ H in kcal/mol) for CH4(A), C2H6 (B) and CH3Br (C) is (1) C>B>A (2) B>C>A (3) C>A>B (4) A>B>C

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Q. The correct order for homolytic blood dissociation energies (

Δ H

k c a l / m o l

{C H}_{4} (A), C_{2} H_{6} (B), {C H}_{3} B r (C)

Q. If the dissociation energy of

C H_{4}

368 kcal/mol

C_{2} H_{6}

628 kcal/mol

, then calculate the bond energy of

C - C

kcal/mol

:

Q. Bond dissociation energy of

C H_{3} - H

103 k c a l m o l^{- 1}

and heat of formation of

C H_{4} (g)

- 17.88 k c a l m o l^{- 1} .

The dissociation energy of

H_{2} (g)

H

103 k c a l / m o l .

The heat of formation of methyl radical is ?

Q. The bond dissociation energies for single covalent bonds formed between carbon and

A, B, C, D

E

Bond	Bond energy $k c a l {m o l}^{- 1}$
(i) $C - A$	$240$
(ii) $C - B$	$382$
(iii) $C - D$	$276$
(iv) $C - E$	$486$

This indicates that the smallest atom is:

Q. 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:

For the following reaction

C H_{4} (g) + C l_{2} (g) light - - \to C H_{3} C l (g) + H C l (g)

The correct statement is

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General Mechanism of Electrophilic Aromatic Substitution

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