was there any alternate plan of the convention?
New Jersey Plan and Alexander Hamilton's plan
Constitutional Convention (United States)
 Under the New Jersey Plan, as it was called, the Confederation Congress would remain unicameral with each state having one vote. Congress would be allowed to levy tariffs and other taxes as well as regulate trade and commerce. Congress would elect a plural "federal executive" whose members would serve a single term and could be removed by Congress at the request of a majority of state governors. There would also be a federal judiciary to apply US law. Federal judges would serve for life and be appointed by the executives. Laws enacted by Congress would take precedence over state laws. This plan was introduced on June 15.

On June 18, Alexander Hamilton of New York presented his own plan that was at odds with both the Virginia and New Jersey plans
what were the plans proposed at the constitutional convention New Jersey Plan and Alexander Hamilton's plan what was proposed in the former one? The Confederation Congress would remain unicameral with each state having one vote and Congress would be allowed to levy tariffs and other taxes as well as regulate trade and commerce when was it laid down? June 15, 1787 what were the operations of the above convention? The first thing the Convention did was choose a presiding officer and the Convention then adopted rules to govern its proceedings who was chosen as this president? George Washington
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Constitutional Convention (United States) [SEP] Alternative plans
The small state delegates were alarmed at the plan taking shape: a supreme national government that could override state laws and proportional representation in both houses of Congress. William Paterson and other delegates from New Jersey, Connecticut, Maryland and New York created an alternative plan that consisted of several amendments to the Articles of Confederation. Under the New Jersey Plan, as it was called, the Confederation Congress would remain unicameral with each state having one vote. Congress would be allowed to levy tariffs and other taxes as well as regulate trade and commerce. Congress would elect a plural "federal executive" whose members would serve a single term and could be removed by Congress at the request of a majority of state governors.