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Which of the following conversion is not possible (algorithmically)?

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MCQ
1.
Consider the grammar given below E? E+E | E*E | E-E | E/E | E^E | (E) | id Assume that + and ^ have the same but least precedence, * and / have the next higher precedence but the same precedence and finally ^ has the highest precedence. Assume + and ^ associate to the left like * and / and that ^ associates to the right. Choose the correct for the ordered pairs (^,^), (-,-), (+,+), (*,*) in the operator precedence table constructed for the grammar.
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MCQ
2.
Which of the following language(s) generates more than one parse tree for a string ?

L1 = {a^nb^mc^md^n ? {a, b, c, d}* | n, m ? 0} 
      ? {a^nb^nc^md^m ? {a, b, c, d}* | n, m ? 0} 

L2 = {a^nb^mc^m ? {a, b, c}* | n, m ? 0} 
      ? {a^nb^nc^m ? {a, b, c}* | n, m ? 0}

L3 = {a^nb^mc^p ? {a, b, c}* | n ? m; n, m ? 0} 
      ? {a^nb^mc^p ? {a, b, c}* | m ? p; n, m ? 0}
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3.
While converting the context free grammar into Greibach normal form, which of the following is not necessary
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4.
Recursively enumerable languages are not closed under ______________
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5.
Consider the following context free languages:
L1 = {0^i 1^j 2^k | i+j = k}
L2 = {0^i 1^j 2^k | i = j or j = k}
L3 = {0^i 1^j  | i = 2j+1}
 Which of the following option is true?
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