Among the following reactions, which one is incorrect?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-nucleophilic-substitution-reaction-q10a.png"><img alt="Nucleophilic substitution reaction - option a" class="alignnone size-full wp-image-224027" height="102" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-nucleophilic-substitution-reaction-q10a.png" width="289"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-nucleophilic-substitution-reaction-q10b.png"><img alt="Nucleophilic substitution reaction - option b" class="alignnone size-full wp-image-224028" height="108" sizes="(max-width: 376px) 100vw, 376px" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-nucleophilic-substitution-reaction-q10b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-nucleophilic-substitution-reaction-q10b.png 376w, https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-nucleophilic-substitution-reaction-q10b-300x86.png 300w" width="376"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-nucleophilic-substitution-reaction-q10c.png"><img alt="Nucleophilic substitution reaction - option c" class="alignnone size-full wp-image-224029" height="110" sizes="(max-width: 391px) 100vw, 391px" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-nucleophilic-substitution-reaction-q10c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-nucleophilic-substitution-reaction-q10c.png 391w, https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-nucleophilic-substitution-reaction-q10c-300x84.png 300w" width="391"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-nucleophilic-substitution-reaction-q10d.png"><img alt="Nucleophilic substitution reaction - option d" class="alignnone size-full wp-image-224030" height="82" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-nucleophilic-substitution-reaction-q10d.png" width="293"/></a>