The dihedral angle in staggered form of Newman projection of 1, 1, 1-Trichloro ethane is ___________ degree. (Round off to the nearest integer)

The number of acyclic structural isomers (including geometrical isomers) for pentene are ___________

When 0.15 g of an organic compound was analyzed using Carius method for estimation of bromine, 0.2397 g of AgBr was obtained. The percentage of bromine in the organic compound is ______________. (Nearest integer)

[Atomic mass : Silver = 108, Bromine = 80]

Using the provided information in the following paper chromatogram :


Fig : Paper chromatography for compounds A and B.

the calculated R_f value of A ________$$\times$$ 10^-1.