8.1. Aldehydes and ketones — Chemistry STD 12 Science — Question

Assertion $(A)$ : Vinyl halides do not undergo nucleophilic substitution easily.

Reason $(R)$ : Even though the intermediate carbocation is stabilized by loosely held $p-$ electrons, the cleavage is difficult because of strong bonding.

$(i)\,CH_3CH_2OH$

$(ii)\ CH_3COCH_3$

$(iii)\ \begin{array}{*{20}{c}}
  {C{H_3} - CHOH} \\ 
  {\,\,|} \\ 
  {\,\,\,\,\,\,C{H_3}} 
\end{array}$

$(iv) \,CH_3OH$

Which of the above compound(s), on being warmed with iodine solution and $NaOH,$ will give iodoform ?

$(A)$ Ethane-$1\ 2$-diamine is a chelating ligand.

$(B)$ Metallic aluminium is produced by elecrtrolysis of aluminium oxide in presence of cryolite.

$(C)$ Cyanide ion is used as ligand for leaching of silver.

$(D)$ Phosphine act as a ligand in Wilkinson catalyst.

$(E)$ The stability constants of $\mathrm{Ca}^{2+}$ and $\mathrm{Mg}^{2+}$ are similar with $EDTA$ complexes.

Choose the correct answer from the options given below:

Reason : $Six F$ atoms in $SF_6$ prevent the attack of $H_2O$ on sulphur atom of $SF_6$.