The maximum number of stereoisomers possible for the compound given below is ________ 
The maximum number of stereoisomers possible for a compound is determined by the formula 2n, where n is the number of stereocenters. A stereocenter is typically a carbon atom bonded to four different groups. Let's analyze the given compound.
1. **Identify Stereocenters:**
a. The compound contains two carbon atoms attached to the central ring system that can serve as stereocenters. Both have four different substituents:
i. The carbon with the methyl (Me) group adjacent to the carbonyl group
ii. The carbon with the nitro (NO2) group on the benzene ring.
2. **Calculate Maximum Stereoisomers:**
a. With n = 2 stereocenters, the maximum number of stereoisomers = 22 = 4.
3. **Verify Range:**
a. The calculated number of stereoisomers is 4, which fits the provided range of 4,4.
Therefore, the maximum number of stereoisomers possible for the given compound is 4.
The reaction(s) that give(s) meso-1,2-diphenylethane-1,2-diol as the major product is(are)
In the following reaction, 13.4 grams of aldehyde P gave a diastereomeric mixture of alcohols Q and R in a ratio of 2:1. If the yield of the reaction is 80%, then the amount of Q (in grams) obtained is ________ (in integer).

The correct statement(s) about the relationship for the H-atoms in the following compounds is (are):
The favourable transition state leading to the formation of the product in the following reaction, is
