Which of the following statements about substitution reactions is true? A) One s

Question

Which of the following statements about substitution reactions is true? A) One sigma bond breaks and another forms at a different carbon atom. B) One pi bond breaks and another forms at the same carbon atom. C) Substitution reactions involve sigma bonds. D) Substitution reactions involve pi bonds. Cycloalkanes are characterized by the general molecular formula: A) C_n H_2n+2 B) C_n H_2n+4 C) C_n H_2n D) C_nH_2n-2 Which of the following pair does not represent resonance structures? A) I B) II C) IV D) III What is the IUPAC name for the following compound? A) 1-Ethyl-3-methylcyclohexane B) 3-Ethyl-1-methylcyclohexane C) 1-Ethyl-3-methylhexane D) 3-Ethyl-1-methylhexane

Explanation / Answer

79) option C

Substitution involes breaking sigma bond and forming a new sigma bond at the same carbon mostly.

Thus option C is right.

80) Cycloalkanes and alkenes have same genral molecular formula CnH2n

81) option D

In structures III, the position of atoms C and N are exchanged.

In resonance structures , only the electrons move but not atoms.

so the two structures in III are not resonance structrues.

82) OPtion A is correct.

When ethyl and methyl can occur at same positions from either side, precedence goes to ethyl as it is first cited in the alphabetical order.

Thus the name is 1-ethyl-3-methylcylohexane.

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