81. In the reaction shown below, identify the correct combination of the intermediate P and the product Q.
82. The major product formed in the reaction of cyclo pentadiene with a mixture of dichloro acetyl chloride and triethylamine is
83. Among the following the acid which undergoes fastest decarboxylation is
84. The major product P of the following reaction is
85. Among the following, the most stable isomer for 3-methoxycydohexanol is
86. The major product formed in the following reaction is
87. Phenol on reaction with formaldehyde and dimethyl amine mainly gives
88. β-D-glucose is represented as
89. The major product formed in the reaction of 1, 5-cyclooctadiene with 0.5 equivalent of diborane is
90. The following tetraene upon photolysis gives
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