The Prime Minister faced the charge from the TUC after warning that a future Tory government would force 18- to 25-year-olds to "earn or learn" or lose benefits.
In his keynote speech to the Conservative conference, he called for his party to be given another term in office to "finish the job" of building Britain's recovery and creating a "land of opportunity for all".
The TUC's Frances O'Grady said: "Given the Government's awful track record of helping young people find jobs, the Prime Minister's threat to ban the dole for under-25s will simply push hundreds of thousands of young people, including those with young families, even deeper into poverty."
He said on the key policy issues, Scotland remaining in the Union was "unanswerable" and the message the English, Welsh and Northern Irish had for the Scots was "we want you to stay".
Iain Macwhirter: Page 15
Leader comment: Page 16