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Question

Which of the following is not a meta directing group?

A
NH3
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B
H3COO||P|OCH3O
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C
B(OH)2
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D
CH3
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Solution

The correct option is D CH3
(a) NH3 is meta directing group due to strong -I effect.

(b) Dimethyl phenyl phosphate always exists in polar form.
H3COO||P|OCH3..OPhH3COO|P|OCH3=OPh
Hence it is an electron withdrawing group.

(c) B(OH)2 has incomplete octet so it is also an electron withdrawing group through -R and -I effect.

(d) CH3 is ortho and para directing group through hyperconjugation.

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