MCQ
In a double bond between two carbon atoms of ethene, there are
- ATwo sigma bonds perpendicular to each other
- ✓One sigma and one pi bond
- CTwo pi bonds perpendicular to each other
- DTwo pi bonds at an angle of ${60^o}$
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$(i)$ they are polymers with hydrophobic character
$(ii)$ they are biocompatible
$(iii)$ in general, they have high thermal stability and low dielectric strength
$(iv)$ usually they are resistant to oxidation and used as greases.

(Assume: Momentum is conserved when photon is absorbed. Use: Planck constant $=6.6 \times 10^{-34} J s$, Avogadro number $=6 \times 10^{23} mol ^{-1}$, Molar mass of $He =4 g mol ^{-1}$ )