Aldehydes, Ketones and Carboxylic Acids

Considering LiBH4 reduces an ester group to the corresponding alcohol and does not reduce a carboxylic acid group, the correct statement about the major products P, Q, R and S is [figure]

1. P & Q are identical, and R & S are diastereomers.
2. P & Q are diastereomers, and R & S are identical.
3. P & Q are diastereomers, and R & S are diastereomers.
4. P & Q are identical, and R & S are identical.

Natural rubber on complete ozonolysis ( O3/Zn-H2O) gives compound X as the major product. X gives positive iodoform and Tollen's tests. X on heating with aqueous NaOH gives Y as the major product. Y is

1. [figure]
2. [figure]
3. [figure]
4. [figure]

The correct reaction/reaction sequence that would produce a dicarboxylic acid as the major product is

1. [figure] [ (iii) H3O+] (i) NaCN; (ii) HO-, H2O
2. arraycCHO\ |\ (CHOH)4\ |\ CH2OH array Br2, H2O
3. [figure] [(ii) KMnO4, H2SO4, ](i) KOH, EtOH
4. [figure] H2CrO4

Monocyclic compounds P, Q, R and S are the major products formed in the reaction sequences given below. [figure] The product having the highest number of unsaturated carbon atom(s) is

1. P
2. Q
3. R
4. S