Question

Assertion:Corey-House reaction can be used to prepare both symmetrical and unsymmetrical alkanes.
Reason:The reaction involves the interaction between lithium dialkyl copper with an alkyl halide both of which may contain even or odd numbers of carbon atoms.
A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
C) Assertion is correct but reason is incorrect.
D) Both Assertion and Reason are incorrect.

Answer 1

Hint: In order to answer this question, you must recall the Corey-House reaction and how it can be used to prepare different kinds of products. Go through its reaction and check whether the reason given is correct or not. And finally select the most suitable option.


Complete solution:
Step 1: Firstly, understand the Corey-House Reaction:
Corey–House synthesis (also called the Corey–Posner–Whitesides–House reaction and other permutations) is an organic reaction that involves the reaction of a lithium dialkylcuprate with an organyl (pseudo)halide $(R'X)$ to form a new alkane, as well as an ill-defined organocopper species and lithium halide as byproducts.
The Corey–House reaction constitutes a general and high yielding method for the joining of two alkyl groups or an alkyl group and an aryl group.
Lastly, and the most important point is that Corey -House reaction can be used to prepare both symmetrical and unsymmetrical alkanes in good yield because Lithium dialkylcopper thus obtained on subsequent treatment with a suitable alkyl halide gives the desired alkane of which may contain even or odd number of carbon atoms.
Step 2: From going through the above mentioned points (specially the last point) we can conclude that the Assertion statement is correct and also the reason given for that is also correct.
And hence, the correct answer is Option A.


Note: The Grignard reaction is an organometallic chemical reaction in which alkyl, allyl, vinyl, or aryl-magnesium halides (Grignard reagent) in an aldehyde or ketone are added to a carbonyl ring. The reaction is critical for carbon – carbon bond formation.