MCQ
The tendency to form monovalent compounds among the Group $13$ elements is correctly exhibited in :
- ✓$B < Al < Ga < In < Tl$
- B$Tl < In < Ga < Al < B$
- C$Tl \approx In < Ga < Al < B$
- D$B \approx Al \approx Ga \approx In \approx Tl$
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$(I)\, (CH_3)_2P(CF_3)_3$ is non-polar and $(CH_3)_3P(CF_3)_2$ is polar molecule
$(II)\, CH_3 \widehat{P} CH_3$ bond angles are equal in $(CH_3)_3P(CF_3)_2$ molecule
$(III)\,PF_3$ will be more soluble in polar solvent than $SiF_4$

(given $R = \frac{{8.3\,J}}\,{{mol - K}}$, $1$ $lit$ -$atm$ $=$ $100$ $J$ $ln$ $2$ $=$ $0.693$)