| $A$. ग्रिग्नार्ड अभिकर्मक | $1$. $H_2 / Pd-BaSO_4$ |
| $B$. क्लीमेन्सन अपचयन | $2$. $N_2H_4 / KOH / \text{ethylene glycol}$ |
| $C$. रोज़नमुंड अपचयन | $3$. $CH_3MgX$ |
| $D$. वोल्फ-किश्नर अपचयन | $4$. $Zn-Hg / conc. HCl$ |
| $5$. $H_2 / Ni$ |
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