The function of anhydrous AlCl₃ in the Friedel-Craft's reaction is to :

• absorb water

• absorb HCl

• to produce electrophile

• to produce nucleophile

The linear molecule is :

• CH₃

• C₂H₂

• NH₃

• H₂O

When two double bonds are present on adjacent carbon atoms , the diene is called as :

• conjugated diene

• cumulative diene

• isolated diene

• None of these

B $\stackrel{\mathrm{Lindlar}\text{'}\mathrm{s} \mathrm{catalyst}/{\mathrm{H}}_2}{\leftarrow }$RC$\equiv$CR $\stackrel{\mathrm{Na}/{\mathrm{NH}}_3}{\to }$ A ,

A and B are geometrical isomers (RCH=CHR)

• A is cis , B is trans

• A is trans , B is cis

• A and B both are cis

• A and B both are trans

15.

An element with atomic number 84 and mass number 218 loses one a-particle and two $\mathrm{\beta }$-particles in three successive stages .The resulting element will have :

• at. no. 84 and mass no. 214

• at no. 82 and mass no. 214

• at. no. 84 and mass no. 218

• at. no. 82 and mass no. 218

The homologue of ethyne is :

• C₂H₄

• C₃H₆

• C₃H₃

• C₃H₄

Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas A and an alkaline solution .The solution on exposure to air produces a thin solid layer of B on the surface .The compounds A and B will be :

• Ca₃N₂ , NH₃

• NH₃ , CO₂

• Ca(OH)₂ , CaCO₃

• NH₃ , CaCO₃

Consider the reaction ,

Fe²⁺ $\rightleftharpoons$ Fe³⁺ + e^-

• the reaction towards the left is a reduction

• the reduction towards the right is a reduction

• the reaction towards the right is an oxidation

• the reaction towards the right is an oxidation and the reaction towards the left is an reduction

Structure of (SiO₄)^4- ion is :

• tetrahedral

• square planar

• octahedral

• planar triangular

An organic substance containing carbon , hydrogen and oxygen gave the following percentage composition .

C = 40.687 % , H = 5.085% and O = 54.228 % 

What is the empirical formula of the compound ?

• CH₃O

• C₂H₂O

• CH₄O

• C₂H₃O₂