What is the rising action and climax in A Raisin in The Sun? Please explain briefly!

It may be best to identify the play's conflicts here as
these represent the narrative threads that culminate in the play's climax where they are
(mostly) concluded. 

There are several minor conflicts in
the play, though each is important to the characters and to the thematic content of the
play. These minor conflicts include Ruth's pregnancy (Will she keep the baby or not?),
Beneatha's relationships with Murchison and Asagai (Will she choose assimilationist
ambition or Pan-African seperatism?), and Walter's plan to open a liquor
store. 

Each of these conflcts drive the action of the play
and contribute to the play's larger conflict, which is essentially defined by the
question of what will happen to the family and symbolized by the house that Mama buys in
the Caucasian neighborhood. Will they move (and stay together) or will they fail to grow
and change positively together and, in so failing, fall
apart? 

The rising action then will include conversations
on each of these topics and the play's climax comes in the moment of decision when
Walter stands up to Linder and defies him, saying that the family will be moving into
the new house. Walter fulfills Mama's earlier exhortation here to "be the head of this
family from now on like you supposed to be."