Question

write the molecular formula of first two members of homologous series having functional group Cl

Answer 1

HI !

First two members of homologous series having functional group - Cl are :-

1. CH₃Cl - Chloromethane
2. C₂H₅Cl - Chloroethane 

These series have a difference of -CH₂- unit

Answer 2

ANSWER:

There will be six elements which the last electron will have quantum numbers as n = 4 and l = 1.

EXPLANATION:

    The elements with the last electron going into the 4p orbitals will be the elements in which the last electron will have the quantum numbers as n = 4 and l = 1. So these elements will be the ones with last electrons in $4 p^{1}, 4 p^{2}, 4 p^{3}, 4 p^{4}, 4 p^{5}, 4 p^{6}$.

   As these are 6 elements so the number of elements in which the last electron will have quantum numbers as n = 4 and l = 1 are six.