Statement-I : Addition of `HBr` to `1-`butene gives two optical isomers.
Because
Statement-II : The product contains one asymmetric carbon.

statement I: Addition of Br_(2) to 1 -butene gives two optical isomers. statement II: The product contains one asymmetric carbon atoms.

Statement-I : Nitration of toluene is easier than benzene Because Staement-II : The methyl group in touene is electron-releasing

In the following questions, a statement of assertion (A) is following by a statement of reason (R ) A : The number of optically active isomers of tartaric acid is three though it contains two asymmetric carbons. R: One of the optical isomers has a centre of symmetry..

Statement-I : There are two spherical nodes in 3s-orbital. Because Statement-II : There is no angular node in 3s-orbital.

Statement-I : Of two isomeric alkennes shown, II is more stable than I . Because Statement-II : The alkene (II) has sp^(2)-hybridlzed carbons.

Statement-I : 2p orbitals do not have spherical nodes. Because Statement-II : The number of spherical nodes in p-orbitals is given by (n-2)

Statement-I : Each electron in an atom has two spin quantum numbers. Because Statement-II : Spin quantum numbers are obtained by solving Schrodinger wave equation.

Statement-I: Ketones are less reactive than aldehydes. Because Statement-II: Ketones do not give Schiff's test.

Statement-I: Benzoic acid on nitration will give m- nitro benzoic acid. Because Statement-II: -COOH group will increase e^(-) density on meta position.

Statement-I : Nitrobenzene does not undergo Friedel-Craft's reaction. Because Statement-II : Nitrogroup is a deactivating group.