Question

Which molecule has both shape and geometry identical?
i. $SnC{l_2}$
ii. $N{H_3}$
iii. $PC{l_5}$
iv. $S{F_4}$
A. I, III and IV
B. II, III and IV
C. III
D. All

Answer 1

In the given question firstly we have to define exactly what the steps of the reaction are. Now after that we get the number of steps and can give the reactions involved in the process of this conversion. Here the 2 steps are dehydration and addition respectively.

Complete step by step answer:
The given question statement asks about the entire process through which we would be able to get the proper and correct explanation of all the steps involved in the reaction. So we have to explain what exactly are the reactions and the correct answer of the problem.
The molecule of $PC{l_5}$ has a geometry which is known as the trigonal bipyramidal geometry which indeed is $s{p^3}d$ hybridization. The $PC{l_5}$ have a shape of a trigonal bipyramid. This is also because of the reason that there are no lone pairs in order to distort the geometry of the molecule. Hence we can say that both the shape and the geometry are the same.
Therefore we can say that the molecule we need is of $PC{l_5}$ and the correct answer to the given problem is the option C, $PC{l_5}$ .

So, the correct answer is Option C.

Note: $PC{l_5}$ finds use as a chlorinating reagent. It is a colourless, water-sensitive and moisture-sensitive solid, although commercial samples can be yellowish and contaminated with hydrogen chloride.