The correct match for the Bond Dissociation Energy (BDE) of the C-H bonds of the compounds in column I, with the values in column II is (As an example the BDE of Me-H is 105.0 kcal/mol)
Column I
Column II BDE (kcal/mol)
a.
[object Object]
i.
110.9
b.
[object Object]
ii.
71.1
c.
[object Object]
iii.
132.0
d.
$\mathrm{HC \equiv C-H}$
iv.
90.6
(a)a-iii, b-iv, c-i, d-ii
(b)a-i, b-iii, c-ii, d-iv
(c)a-iii, b-i, c-iv, d-ii
(d)a-iv, b-i, c-ii, d-iii
Answer
Answer (as printed): D
Explanation
To check BDE we have to see the stability of free radical formed after bond cleavage, the order is as follows Hence, correct option is (d)
Explanation as extracted from the printed page; notation may be imperfect.