Question

Butane-2, 3-dione on reaction with `PCl_(5)` changes its molecular mass by X amu. The value of X is
A. 71
B. 142
C. 110
D. 35.5

Answer 1

Correct Answer - C
`underset(("Mol mass = 86"))(CH_(3)-overset(O)overset(||)C-overset(O)overset(||)C-CH_(3))overset(PCl_(5))rarrunderset("Mol. mass = 196")(CH_(3)-overset(Cl)overset(|)underset(Cl)underset(|)C-overset(Cl)overset(|)underset(Cl)underset(|)C-CH_(3))`
Change in mol. mass = 196 - 86 = 110