Q. The decreasing order of basicity of the following amines is :

1. $\left(II\right)>\left(III\right)>\left(IV\right)>\left(I\right)$
2. $\left(I\right)>\left(III\right)>\left(IV\right)>\left(II\right)$
3. $\left(III\right)>\left(II\right)>\left(I\right)>\left(IV\right)$
4. $\left(III\right)>\left(I\right)>\left(II\right)>\left(IV\right)$

Q. The number of $s{p}^2$ hybrid orbitals in a molecule of benzene is :

1. $12$
2. $24$
3. $18$
4. $6$

Q. The solubility product of $Cr(OH{)}_3$ at $298K$ is $6.0\times {10}^{-31}$. The concentration of hydroxide ions in a saturated solution of $Cr(OH{)}_3$ will be :

1. $(2.22\times {10}^{-31}{)}^{1/4}$
2. $(4.86\times {10}^{-29}{)}^{1/4}$
3. $(18\times {10}^{-31}{)}^{1/2}$
4. $(18\times {10}^{-31}{)}^{1/4}$

Q. Which of the following reactions will not produce a racemic product?

Q. Which polymer has 'chiral' monomer(s)?

1. $PHBV$
2. Nylon $6,6$
3. Buna$-N$
4. Neoprene