Does touching women temporarily forbidden in marriage nullify ablution?

It is prohibited to touch, or to shake hands with such women as they are considered strangers, and doing so nullifies ablution.

Is it permissible for a wife to refuse to go to bed with her husband (for sexual intercourse)?

It isn`t permissible for her to do so unless for a sound reason.

Has Islam made it incumbent on us to give our children particular names?

No, it hasn`t, but it is desirable that we give them good names.

What is the ruling on working for a company that manufactures cigarettes?

All Perfect Praise is due to Allah, The Lord of The Worlds

Working for a company that manufactures cigarettes is forbidden because smoking itself is forbidden, so its production, selling and circulation are forbidden as a result since they aid in committing sin, and whoever aids in that is like the sinner himself. And Allah Knows Best.