How many of the following disproportionate on treatment with NaOH (under suitable conditions)
(i) $B$     (ii) $C$    (iii) $Si$  (iv) $F_2$ (v) $C{l}_2$   (vi) $B{r}_2$ (vii) $l_2$ (viii) $P_4$   (ix) $S$ ___

Among the following complexes the one which shows Zero crystal field stabilizations energy (CFSE)?

Two identical coherent sources placed on a diameter of a circle of radius $R$ at separation $x(\ll R)$ symmetrically about the centre of the circle. The sources emit identical wavelength $\lambda$ each. The number of points on the circle with maximum intensity is $(x=5\lambda )$

The interstitial hole is called tetrahedral because :

The product formed in Aldol condensation is:

Write the equation involved in the following reactions:
(i) Reimer-Tiemann reaction (ii) Kolbe's reaction

Among the following complexes the one which shows Zero crystal field stabilizations energy (CFSE)?

Two identical coherent sources placed on a diameter of a circle of radius $R$ at separation $x(\ll R)$ symmetrically about the centre of the circle. The sources emit identical wavelength $\lambda$ each. The number of points on the circle with maximum intensity is $(x=5\lambda )$

The interstitial hole is called tetrahedral because :