The correct sequence of reagents used in the | vedclass

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(D) The synthesis of $4-$bromo$-2-$nitroethylbenzene from benzene involves the following steps:$1$. Friedel-Crafts acylation of benzene with $CH_3COCl

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$CH_3COCl / AlCl_3, Zn-Hg / HCl, Br_2 / AlBr_3, HNO_3 / H_2SO_4$

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(D) The synthesis of $4-$bromo$-2-$nitroethylbenzene from benzene involves the following steps:$1$. Friedel-Crafts acylation of benzene with $CH_3COCl / AlCl_3$ to form acetophenone.$2$. Clemmensen reduction of acetophenone using $Zn-Hg / HCl$ to form ethylbenzene.$3$. Electrophilic aromatic bromination of ethylbenzene using $Br_2 / AlBr_3$ to form $4-$bromoethylbenzene (para-product is major due to steric hindrance at ortho position).$4$. Nitration of $4-$bromoethylbenzene using $HNO_3 / H_2SO_4$ to form $4-$bromo$-2-$nitroethylbenzene.

The correct sequence of reagents used in the preparation of $4-$bromo$-2-$nitroethylbenzene from benzene is:

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The correct decreasing order of densities of the following compounds is:

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