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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3o4157

Which reactions give mainly an elimination product (alkene)?

A $(CH X_{3}) X_{3} C - Br$ with $NaOEt$ in ethanol, heat
B $CH X_{3} CH X_{2} CH X_{2} Br$ with $NaI$ in acetone
C2-bromo-2-methylbutane with $(CH X_{3}) X_{3} COK$ in $(CH X_{3}) X_{3} COH$
D $CH X_{3} Br$ with aqueous $NaOH$

Answer: A, C

A tertiary halide with a strong base undergoes E2 (first and third). The primary halide with iodide in acetone gives SN2, and methyl bromide has no beta-hydrogen, so it gives substitution to methanol.

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