Which of the following is a geocarpic fruit?

In an experiment with $15$ observations on $x$,the following results were available: $\sum x^2 = 2830$ and $\sum x = 170$. One observation that was $20$ was found to be wrong and was replaced by the correct value $30$. Then the corrected variance is:

Indicate the number of unpaired electrons in:
$(a)$ $P$ $(b)$ $Si$ $(c)$ $Cr$ $(d)$ $Fe$ and $(e)$ $Kr$

The process of caustification is used for the preparation of which of the following?

Consider the following bromides:
The correct order of $S_N1$ reactivity is

Data Entry - Physics