Ethylidene chloride is \(CH_3 – CHCl_2\), its IUPAC name is 1,1-Dichloromethane.
So, the correct option is (D).
What will be the equilibrium constant of the given reaction carried out in a \(5 \,L\) vessel and having equilibrium amounts of \(A_2\) and \(A\) as \(0.5\) mole and \(2 \times 10^{-6}\) mole respectively?
The reaction : \(A_2 \rightleftharpoons 2A\)

Cobalt chloride when dissolved in water forms pink colored complex $X$ which has octahedral geometry. This solution on treating with cone $HCl$ forms deep blue complex, $\underline{Y}$ which has a $\underline{Z}$ geometry $X, Y$ and $Z$, respectively, are

CH$_3$–Br $\xrightarrow{\text{CH$_3$OH/Nu}}$ CH$_3$OH
Correct order of rate of this reaction for given nucleophile:

What will be the equilibrium constant of the given reaction carried out in a \(5 \,L\) vessel and having equilibrium amounts of \(A_2\) and \(A\) as \(0.5\) mole and \(2 \times 10^{-6}\) mole respectively?
The reaction : \(A_2 \rightleftharpoons 2A\)
‘Alkyl halide’ is the very common name for haloalkanes. The written format for haloalkane in the IUPAC name is “numerical position-alphabetically placed halo- root-word-ane”
‘Aryl Halide’ is the very common name for haloarenes. In the nomenclature system, the numerical prefixes are named, depending on the basic position of the halogen atom in the aromatic ring.
In presence of more than one halogen atom, the halogen group is named and the aromatic ring is numbered based on the numerical position of the aromatic ring. Numerical prefixes are written in the format (1, 2) ; (1,3) ; (1,4). Always the least number is given to the halogen number.
Read More: Nomenclature of Haloalkanes and Haloarenes

Nomenclature of Haloalkanes and Haloarenes