A compound with molecular formula `C_(7)H_(16)` shows optical isomerism, the compound will be

Compound with molecular formula C_3H_6O can show

Compound with molecular formula C_3 H_6 O can show :

Total number of compounds with molecular formula C_(5) H_(10) which can show geometrical isomerism are (only cyclic)?

A compound with molecular formula C_(4) H_(10) O , can show metamerism, functional isomerism and positional isomerism. Justify the statement.