Q. The reactivity of compound Z with different halogens under appropriate conditions is given above. The observed pattern of electrophilic substitution can be explained by:

1. the steric effect of the halogen
2. the steric effect of the tert-butyl group
3. the electronic effect of the phenolic group
4. the electronic effect of the tert-butyl group

Q. In a galvanic cell, the salt bridge :

1. does not participate chemically in the cell reaction
2. stops the diffusion of ions from one electrode to another
3. ensures mixing of the two electrolytic solutions
4. is necessary for the occurrence of the cell reaction

Q. The pair(s) of reagents that yield paramagnetic species is/are:

1. $Na$ and excess of $N{H}_3$
2. $K$ and excess of $O_2$
3. $Cu$ and dilute $HN{O}_3$
4. $O_2$ and 2 - ethylanthraquinol

Q. In the reaction shown below, the major product(s) formed is/are:

1. 
   
2. 
   
3. 
   
4. 
   

Q. For the reaction:
$I^{-}+Cl{O}_3^{-}+H_{2}S{O}_4\to C{l}^{-}+HS{O}_4^{-}+I_2$
The correct statement(s) in the balanced equation is/are :

1. stoichiometric coefficient of $HSO$${}_4^{-}$ is $6$
2. iodide is oxidized
3. sulphur is reduced
4. $H_{2}O$ is one of the products

Q. Hydrogen bonding plays a central role in the following phenomena :

1. Ice floats in water.
2. Higher Lewis basicity of primary amines than tertiary amines in aqueous solutions.
3. Formic acid is more acidic than acetic acid.
4. Dimerisation of acetic acid in benzene.

Q. Upon heating with $C{u}_{2}S$, the reagent(s) that give copper metal is/are:

1. $CuFe{S}_2$
2. $C{u}_{2}O$
3. $CuO$
4. $CuS{O}_4$

Q. An ideal gas in a thermally insulated vessel at internal pressure $=$ P${}_1$, volume $=$ V${}_1$ and absolute temperature $=$ T${}_1$ expands irreversibly against zero external pressure, as shown in the diagram. The final internal pressure, volume and absolute temperature of the gas are P${}_2$, V${}_2$ and T${}_2$, respectively. For this expansion,

1. $T_2=T_1$
2. $q=0$
3. $P_2{V}_2=P_1{V}_1$
4. $P_2{V}_2^{\gamma }=P_1{V}_1^{\gamma }$

Q. The correct combination of names for isomeric alcohols with molecular formula $C_4{H}_{10}O$ is/are:

1. tert-butanol and 1, 1-dimethylethan-1-ol
2. isobutyl alcohol and 2-methylpropan-1-ol
3. tert-butanol and 2-methylpropan-2-ol
4. n-butanol and butan-1-ol

Q. The correct statement(s) for orthoboric acid is/are:

1. It behaves as a weak acid in water due to self ionization.
2. It is a weak electrolyte in water.
3. Acidity of its aqueous solution increases upon addition of ethylene glycol.
4. It has a three dimensional structure due to hydrogen bonding.