Under review — part of this question (a structure or an option) is not clear in the source scan. 4AB is checking it against the original book; the answer shown may change.
A and F 3. A and D 4. C and E
(a)Ti(Ch2Ph) 4 <Ti(i-pr) 4 <TiEt4 < TiMe4
(b)TiEt4 <TiMe4 <Ti(i-Pr) 4 <Ti(CH2Ph)4
(c)Ti(i-Pr)4 <TiEt4 <TiMe4 <Ti(CH2Ph)4
(d)TiMe4 < TiEt4 <Ti(i-Pr) 4 <Ti(CH2Ph)4
Answer
Under review — not yet confirmed.
Answer: C
Explanation
Alkyls with β-H decompose by β-elimination (i-Pr worst, then Et); Me and benzyl have none, and benzyl is further stabilised (η² interaction): Ti(i-Pr)₄ < TiEt₄ < TiMe₄ < Ti(CH₂Ph)₄ (c).