The aldehydes which will not form Grignard product with one equivalent Grignard reagents are

a) 12.01.2019 Shift 2 Synergy JEE Mains D76

 

b) 12.01.2019 Shift 2 Synergy JEE Mains D77

 

c) 12.01.2019 Shift 2 Synergy JEE Mains D78

 

d) 12.01.2019 Shift 2 Synergy JEE Mains D79

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  1. (c), (d)
  2. (b), (d)
  3. (b), (c), (d)
  4. (b), (c)

Answer (Detailed Solution Below)

Option 2 : (b), (d)
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JEE Main 04 April 2024 Shift 1
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Detailed Solution

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Concept:

Grignard reagent usually attacks on > C = O group as:

12.01.2019 Shift 2 Synergy JEE Mains D83

The question is related to above reaction only with the condition that the consumption of RMgX will be more than 1 equivalent in some of the given cases.

Among the given compounds B, i.e.

12.01.2019 Shift 2 Synergy JEE Mains D80

Contain additional groups which can give active hydrogen’s. Grignard reagents produces alkanes whenever come in contact with any group or compound which can give active hydrogen as:

12.01.2019 Shift 2 Synergy JEE Mains D81

These reactions are equivalent to acid-base reactions. So, in both of these compounds more than one equivalent will be required to form Grignard products. Remember these compounds will give 2 type of products as:

(i) from the > C = O group

(ii) from the group which release active hydrogen.

The additional reactions involved are:

12.01.2019 Shift 2 Synergy JEE Mains D82

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