NCERT Chemistry 12th

 Bond is weaker then $$ - $\sigma$ bond.

This is a multiple choice answer as classified in NCERT Exemplar

(II) ^ΘOR 

The species which is the weakest acid has the strongest conjugate base.  The ROH is the weakest acid among the given compounds  due to the inductive effect of the alkyl group. Therefore,   the strongest conjugate base is ^ΘOR.

Students while studying Coordnation Compound Chapter 5 must make a handy notes of formulas, definations, atomic number / weight, diagrams. These notes will be helpful in quick revision.

The ncert solutions for Class 12 Coordination Compound is updated on this artcile. Students can get the detailed solutions for intext and exericses here. 

Students can refer the NCERT Solutions for Class 12 Chemistry Chapter 4 The d and f block Elements shared by the experts at Shiksha for NCERT Chemisytry textbook questions. The solutions for CBSE Chemistry d and f block questions is explanined in easy way for better understanding.

Students need to practice the Class 12 Chemistry previous year question to identify the important questions. Some of important questions are reactions of $K_2Cr_2O_7$K2? Cr2? O7? and $KMnO_4$KMnO4? in acidic, basic, and neutral medium, lanthanide contraction and its consequences, balancing redox reactions, etc.

Students can use the class 12 previous year d and f block questions pdf to prepare for the exam and self-assessment. NCERT solutions enhace the proble sloving skills by explaning the complex questions in easy way.