Which are the dissimilarities between CO and PF_3

MCQ

Which are the dissimilarities between $CO$ and $PF_3$

A
$PF_3$ is a $\sigma-$ donor, $\pi-$ acceptor while $CO$ is $\pi-$ donor, $\pi-$ acceptor towards a metal/ metal ion in a complex
B
$CO$ is toxic while $PF_3$ is nontoxic
C
$CO$ is odourless while $PF_3$ has pungent odour
✓
$CO$ acepts back donation into its $\pi^*$ orbital while $PF_3$ accepts back donation into its $3d$ orbital in a complex

✓

Answer

Correct option: D.

$CO$ acepts back donation into its $\pi^*$ orbital while $PF_3$ accepts back donation into its $3d$ orbital in a complex

d

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$A$. Tollen's reagent $B$. Schiff's reagent $C$. $\mathrm{HCN}$ $D$. $\mathrm{NH}_2 \mathrm{OH}$ $E$. $\mathrm{NaHSO}_3$

Choose the correct options from the given below:

Statement $I$ : Boron is extremely hard indicating its high lattice energy

Statement $II$ : Boron has highest melting and boiling point compared to its other group members.

In the light of the above statements, choose the most appropriate answer from the options given below

$\mathop {Salt\,\,'A'}\limits_{(Colourless)} \,\,\xrightarrow{{Cu}}$ Blue solution

$\mathop {Salt\,\,'A'}\limits_{(Colourless)} \,\,\xrightarrow[{(aq)}]{{HCl}}$ White ppt

$\mathop {Salt\,\,'A'}\limits_{(Colourless)} \,\,\xrightarrow[{{H_2}S{O_4}}]{{Conc.}}$ Brown fumes