JEE CHEMISTRY MCQ: S-BLOCK ELEMENTS

1 Medium

1 of 1

Analyzing +4 | -1

An allylide on hydrolysis gives allylene. The alkaline the earth metal cation of allyhide dissolves in dry ether in the presence of alkyl halide to form Grignard reagent. The allylide is

View answer and explanation

Correct option: A

\mathrm{Mg}_2 \mathrm{C}_2

Option A (

\mathrm{Mg}_2 \mathrm{C}_2

) is correct because it is the allylide that on hydrolysis gives allylene and reacts with alkyl halide in dry ether to form Grignard reagent.

More Questions from S-BLOCK ELEMENTS

Practice All Chapter MCQs →

Assertion (A): Among the alkali metals, lithium salts exhibit the least electrical condutance in aqueous solutions.
Reason (R): Smaller the radius of the hydrated cation, lower is the electrical conductance in aqueous solutions.

(A)

is a ternary salt with divalent cation.

(A)

gives yellow ppt. with

\mathrm{K}_2 \mathrm{CrO}_4

as well as with

\mathrm{AgNO}_3

. (A) is precipitated by

\mathrm{H}_2 \mathrm{~S}

neither in acidic nor ammoniacal medium, but addition of

\left(\mathrm{NH}_4\right)_2 \mathrm{CO}_3

\mathrm{NH}_4 \mathrm{OH}

gave white ppt. (B).

0.297 \mathrm{~g}

(A)

gave

0.197 \mathrm{~g}

(B)

. Identify

(A)

. In the Down’s cell

\mathrm{KCl}

is added in

\mathrm{NaCl}

to: Which of the alkali metal is having least melting point? Fusion mixture is comprised of: Statement 1:

{LiCl}

is predominatly a covalent compound.

Statement 2: Electronegativity difference between

{Li}

and

{Cl}

is too small.