Would like to know whether wife’s orgasm is mandatory to have to get pregnant, or husbands ejaculation is enough during intercourse

A women doesn't have to have an orgasm to get pregnant.

No, the wife does not have to reach an orgasm to get pregnant.

When a woman orgasms she releases vaginal fluids much like a man releases seminal fluids when he orgasms. These fluids help aide in nourishing and transporting sperm. It is not needed though to achieve pregnancy. When a woman is near ovulation her body produces these fluids in excess to help prepare for sperm.