1
JEE Main 2021 (Online) 27th July Evening Shift
Numerical
+4
-1
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The dihedral angle in staggered form of Newman projection of 1, 1, 1-Trichloro ethane is ___________ degree. (Round off to the nearest integer)
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2
JEE Main 2021 (Online) 22th July Evening Shift
Numerical
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-1
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The number of acyclic structural isomers (including geometrical isomers) for pentene are ___________
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3
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
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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]
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4
JEE Main 2021 (Online) 25th February Morning Shift
Numerical
+4
-1
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Using the provided information in the following paper chromatogram :

JEE Main 2021 (Online) 25th February Morning Shift Chemistry - Basics of Organic Chemistry Question 139 English
Fig : Paper chromatography for compounds A and B.

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